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HTML 

              
                <div class="phone">
  <div class="phone-screen">
    <div class="phone-header">
      <div class="phone-signal">Carrier</div>
      <div class="phone-time">12:00</div>
      <div class="phone-battery"></div>
    </div>
    <div class="app">
      <header class="app-header">
        <div class="app-category">Fish</div>
        <div class="open-search button"><div class="icon-search"></div></div>
        <div class="open-foldmenu button"></div>
        <nav class="foldmenu">
          <ul>
            <li class="foldmenu-item">
              <div class="foldmenu-header">
                <div class="foldmenu-header-icon icon-html5"></div>
                <div class="foldmenu-header-caption">Corals</div>
              </div>
              <ul class="foldmenu-sub">
                <li><a class="foldmenu-sub-item" href="#">SPS Corals</a></li>
                <li><a class="foldmenu-sub-item" href="#">LPS Corals</a></li>
                <li><a class="foldmenu-sub-item" href="#">Mushrooms</a></li>
                <li><a class="foldmenu-sub-item" href="#">Soft Corals</a></li>
                <li><a class="foldmenu-sub-item" href="#">Polyps</a></li>
              </ul>
            </li>
            <li class="foldmenu-item">
              <div class="foldmenu-header">
                <div class="foldmenu-header-icon icon-css3"></div>
                <div class="foldmenu-header-caption">Fish</div>
              </div>
              <ul class="foldmenu-sub">
                <li><a class="foldmenu-sub-item" href="#">Sub-item 1</a></li>
                <li><a class="foldmenu-sub-item" href="#">Sub-item 2</a></li>
                <li><a class="foldmenu-sub-item" href="#">Sub-item 3</a></li>
                <li><a class="foldmenu-sub-item" href="#">Sub-item 4</a></li>
                <li><a class="foldmenu-sub-item" href="#">Sub-item 5</a></li>
              </ul>
            </li>
            <li class="foldmenu-item">
              <div class="foldmenu-header">
                <div class="foldmenu-header-icon icon-github"></div>
                <div class="foldmenu-header-caption">Invertebrates</div>
              </div>
              <ul class="foldmenu-sub">
                <li><a class="foldmenu-sub-item" href="#">Sub-item 1</a></li>
                <li><a class="foldmenu-sub-item" href="#">Sub-item 2</a></li>
                <li><a class="foldmenu-sub-item" href="#">Sub-item 3</a></li>
                <li><a class="foldmenu-sub-item" href="#">Sub-item 4</a></li>
                <li><a class="foldmenu-sub-item" href="#">Sub-item 5</a></li>
              </ul>
            </li>
            <li class="foldmenu-item">
              <div class="foldmenu-header">
                <div class="foldmenu-header-icon icon-dribbble"></div>
                <div class="foldmenu-header-caption">Plants</div>
              </div>
              <ul class="foldmenu-sub">
                <li><a class="foldmenu-sub-item" href="#">Sub-item 1</a></li>
                <li><a class="foldmenu-sub-item" href="#">Sub-item 2</a></li>
                <li><a class="foldmenu-sub-item" href="#">Sub-item 3</a></li>
                <li><a class="foldmenu-sub-item" href="#">Sub-item 4</a></li>
                <li><a class="foldmenu-sub-item" href="#">Sub-item 5</a></li>
              </ul>
            </li>
          </ul>
        </nav>
      </header>
      <div class="app-main">
        <header class="item-header">
          <div class="item-image">
            <img src="http://www.liveaquaria.com/images/categories/product/p-80188-clownfish.jpg" width="180" height="180"/>
          </div>
          <h1>Ocellaris clownfish</h1>
          <p>Amphiprion ocellaris</p>
        </header>
        <div class="item-content">
          <div class="item-info">
            <ul>
              <li class="item-info-item">
                <div class="icon-bar-chart"></div>
                20 G
              </li>
              <li class="item-info-item">
                <div class="icon-sun"></div>
                78-84°F
              </li>
              <li class="item-info-item">
                <div class="icon-thumbs-up-alt"></div>
                Yes
              </li>
              <li class="item-info-item">
                <div class="icon-resize-horizontal"></div>
                2"
              </li>
              <li class="item-info-item">
                <div class="icon-heart-empty"></div>
                Easy
              </li>
            </ul>
          </div>
          <div class="item-additional-info">
            <strong>Food:</strong> Meaty foods and frozen icecream
          </div>
        </div>
      </div>
      <footer class="app-footer">
        <nav class="appmenu">
          <ul>
            <li class="appmenu-item">
              <div class="icon-bookmark"></div>
              Bookmarks
            </li>
            <li class="appmenu-item">
              <div class="icon-help"></div>
              Help
            </li>
            <li class="appmenu-item">
              <div class="icon-gear"></div>
              Settings
            </li>
          </ul>
        </nav>
      </footer>
    </div>
  </div>
</div>

<p class="credits">
  Based on <a href="http://dribbble.com/shots/796696-Coral-Reference-Guide-iPhone-App-Submenu">this</a> Dribbble shot.<br/>
  Hint: It's all about the folding menu, don't expect other buttons to work :)<br/>
  Icons are probably not very accurate, sorry!
</p>
!

CSS 

              
                @import "compass/css3";

@import '//netdna.bootstrapcdn.com/font-awesome/3.2.1/css/font-awesome.css';

$screen: #141414;
$statusbar: #ccc;
$bluegray: rgb(37, 50, 59);
$red: rgb(122, 34, 12);

@mixin simplegradient($gradient) {
  background-image: -webkit-linear-gradient(top, $gradient);
  background-image: -moz-linear-gradient(top, $gradient);
  background-image: -o-linear-gradient(top, $gradient);
  background-image: linear-gradient(to bottom, $gradient);
}

/**
 * Default elements
 */

nav ul {
  padding: 0;
  margin: 0;
  list-style: none;
}

/**
 * Resolution constraints (for easy reference)
 */

.phone, .phone-screen {
  width: 320px;
  height: 480px; // phone-header + app
}
.phone-header {
  height: 20px;
}
.app {
  height: 460px; // header + main + footer
}
.app-header {
  height: 44px;
}
.app-main {
  height: 360px;
}
.app-footer {
  height: 56px;
}

/**
 * Default classes
 */

.phone {
  padding: 124px 22px;
  border-radius: 48px;
  margin: 20px auto;
  background-color: #000;
  box-shadow: 0 0 22px #999;
}
.phone-screen {
  overflow: hidden;
  background: $screen;
}
.phone-header {
  position: relative;
  overflow: hidden;
  padding: 0 5px;
  color: $statusbar;
  font-size: 14px;
  line-height: 20px;
}
.phone-signal {
  float: left;
  text-transform: uppercase;
}
.phone-signal:before { // signal icon
  content: '';
  display: inline-block;
  width: 3px;
  height: 4px;
  margin: 0 18px 0 0;
  background: $statusbar;
  box-shadow:
    4px 0, 4px -1px,
    8px 0, 8px -2px,
    12px 0, 12px -3px,
    16px 0, 16px -4px;
}
.phone-time { // funky way to center align in phone header
  position: absolute;
  left: 50%;
  width: 40px;
  margin-left: -20px;
}
.phone-battery { // empty battery shell
  position: relative;
  float: right;
  width: 17px;
  height: 8px;
  border: 1px solid;
  border-radius: 2px;
  margin: 5px 2px 0 0;
}
.phone-battery:before { // battery center fill
  content: '';
  display: block;
  width: 15px;
  height: 6px;
  margin: 1px;
  background: $statusbar;
}
.phone-battery:after { // small right thingy
  content: '';
  position: absolute;
  top: 2px;
  right: -3px;
  display: block;
  width: 1px;
  height: 2px;
  border: 1px solid;
}

.app {
  position: relative;
  background: #fff;
  font-family: 'Source Sans Pro', sans-serif;
  transition: left 0.3s ease;
}
.app-header {
  position: relative;
  @include simplegradient((lighten($red, 5), darken($red, 10)));
  background-color: $red;
  color: #fff;
}
.app-header .button {
  position: absolute;
  top: 8px;
  width: 24px;
  height: 24px;
  border: 2px solid lighten($red, 5);
  border-radius: 4px;
  @include simplegradient((darken($red, 2), darken($red, 10)));
  cursor: pointer;
}
.app-header .button:hover {
  @include simplegradient((lighten($red, 2), darken($red, 10)));
}
.open-foldmenu {
  left: 8px;
}
.open-foldmenu:before { // faux icon
  content: '';
  position: absolute;
  top: 5px;
  left: 4px;
  display: block;
  width: 16px;
  height: 2px;
  background: #fff;
  box-shadow: 0 6px, 0 12px;
}
.open-search {
  right: 8px;
  text-align: center;
  line-height: 24px;
}
.app-category {
  text-align: center;
  font-size: 20px;
  line-height: 44px;
  text-transform: uppercase;
}
.item-header {
  position: relative;
  overflow: hidden;
  height: 259px;
  border-bottom: 1px solid #ccc;
  box-shadow: inset 0 0 16px #ccc;
}
.item-image:before {
  content: '';
  position: absolute;
  top: 2px;
  left: 56px;
  display: block;
  width: 208px;
  height: 208px;
  border-radius: 50%;
  box-shadow: inset 0 0 8px #ccc;
}
.item-image:after {
  content: '';
  position: absolute;
  top: 6px;
  left: 60px;
  display: block;
  width: 200px;
  height: 200px;
  border-radius: 50%;
  @include simplegradient((rgba(#000, 0.2), rgba(#000, 0)));
}
.item-image img {
  display: block;
  margin: 16px auto;
  border-radius: 50%;
  box-shadow: inset 0 0 8px #ccc;
}
.item-header h1 {
  margin: 0;
  color: $bluegray;
  font-size: 18px;
  font-weight: 600;
  text-align: center;
  text-transform: uppercase;
}
.item-header p {
  margin: 0;
  color: $red;
  font-size: 14px;
  text-align: center;
}
.item-header p:before {
  content: '( ';
}
.item-header p:after {
  content: ' )';
}
.item-info {
  height: 62px;
  border: dashed #ccc;
  border-width: 1px 0;
  margin: 2px 0;
}
.item-info ul {
  padding: 0;
  margin: 0;
  list-style-type: none;
}
.item-info-item {
  float: left;
  width: 64px;
  height: 62px;
  color: $red;
  font-size: 14px;
  font-weight: 600;
  text-align: center;
  text-transform: uppercase;
}
.item-info-item [class^="icon-"] {
  display: block;
  width: 52px;
  height: 52px;
  margin: 2px auto -12px;
  border-radius: 50%;
  @include simplegradient((#ccc, #fff 60%));
  color: #777;
  font-size: 24px;
  line-height: 52px;
}
.item-additional-info {
  height: 31px;
  border-top: 1px solid #ccc;
  color: $bluegray;
  font-size: 14px;
  line-height: 32px;
  text-align: center;
  box-shadow: inset 0 0 16px #ccc;
}
.app-footer {
  background-color: $bluegray;
  color: #fff;
}
.appmenu-item {
  float: left;
  width: 106px;
  height: 54px;
  margin: 1px 0 0 1px;
  @include simplegradient(($bluegray 10%, lighten($bluegray, 5) 25%, darken($bluegray, 5)));
  background-color: $bluegray;
  font-size: 14px;
  text-align: center;
  text-transform: uppercase;
  cursor: pointer;
}
.appmenu-item:first-child {
  margin-left: 0;
}
.appmenu-item:hover {
  @include simplegradient(($bluegray 10%, lighten($bluegray, 10) 25%, darken($bluegray, 5)));
}
.appmenu-item [class^="icon-"] {
  display: block;
  width: 1em;
  height: 1em;
  margin: 8px auto 2px;
  font-size: 16px;
}
.appmenu-item .icon-help:before {
  content: '?';
  display: block;
  width: 1em;
  height: 1em;
  border-radius: 50%;
  background: #fff;
  color: $bluegray;
}

.foldmenu {
  position: absolute;
  top: 0;
  right: 100%;
  width: 112px;
  height: 448px; // that's 460px including bottom border
  border-bottom: 12px solid #fff;
  line-height: 1;
}
.foldmenu-header {
  overflow: hidden;
  position: relative;
  width: 112px;
  height: 112px;
  background: #fff;
  color: $bluegray;
  font-weight: 600;
  text-transform: uppercase;
  cursor: pointer;
}
.foldmenu-header:before { // faux box-shadow gradient
  content: '';
  position: absolute;
  top: 24px;
  left: 24px;
  display: block;
  width: 64px;
  height: 64px;
  border-radius: 50%;
  @include simplegradient((#ccc, #fff));
}
.foldmenu-header-icon {
  position: relative;
  box-sizing: border-box;
  display: block;
  width: 56px;
  height: 56px;
  border: 4px solid #ccc;
  border-radius: 50%;
  margin: 28px auto;
  $gradient: center top, circle farthest-side, #eee 50%, #ccc 50%;
  background-image: -webkit-radial-gradient($gradient);
  background-image: -moz-radial-gradient($gradient);
  background-image: -ms-radial-gradient($gradient);
  background-color: #eee;
  font-size: 32px;
  line-height: 48px;
  text-align: center;
  transition: all 0.2s ease;
}
.active .foldmenu-header-icon {
  border-color: rgb(122, 34, 12);
  $gradient: center top, circle farthest-side, rgb(169, 114, 100) 50%, rgb(122, 34, 12) 50%;
  background-image: -webkit-radial-gradient($gradient);
  background-image: -moz-radial-gradient($gradient);
  background-image: -ms-radial-gradient($gradient);
  background-color: rgb(169, 114, 100);
  color: rgb(212, 184, 177);
}
.foldmenu-header-caption {
  position: absolute;
  bottom: 0;
  width: 100%;
  line-height: 24px;
  text-align: center;
}
.foldmenu-sub {
  overflow: hidden;
  height: 0;
}
.foldmenu-sub-item {
  display: block;
  border-width: 1px 0;
  border-style: solid;
  border-color: lighten($bluegray, 2) transparent darken($bluegray, 2);
  background: $bluegray;
  color: #ccc;
  line-height: 32px;
  text-align: center;
  text-shadow: 0 0 4px darken($bluegray, 80);
  text-decoration: none;
}
:first-child > .foldmenu-sub-item {
  border-top: none;
  box-shadow: inset 0 8px 8px -8px #000;
}
:last-child > .foldmenu-sub-item {
  border-bottom: none;
  box-shadow: inset 0 -8px 8px -8px #000;
}
.foldmenu-sub-item:hover {
  background: lighten($bluegray, 2);
}

.credits {
  color: #333;
  font-family: 'Source Sans Pro', sans-serif;
  text-align: center;
  
  a {
    color: #000;
    &:hover {
      color: #333;
    }
  }
}

/**
 * JavaScript generated classes
 */

.foldmenu-perspective {
  perspective: 200px;
}
.foldmenu-fold__top, .foldmenu-fold__bottom {
  overflow: hidden;
  width: 112px;
  height: 56px;
}
.foldmenu-fold__top {
  transform-origin: center top;
  transform: rotateX(0);
}
.foldmenu-fold__bottom {
  transform-origin: center bottom;
  transform: rotateX(0);
}
.foldmenu-fold__bottom .foldmenu-header {
  top: -56px;
}
!

JS 

              
                /**
 * Based on http://dribbble.com/shots/796696-Coral-Reference-Guide-iPhone-App-Submenu
 */


/*
 * RequestAnimationFrame polyfill by Erik Möller
 */
(function(){var b=0;var c=["ms","moz","webkit","o"];for(var a=0;a<c.length&&!window.requestAnimationFrame;++a){window.requestAnimationFrame=window[c[a]+"RequestAnimationFrame"];window.cancelAnimationFrame=window[c[a]+"CancelAnimationFrame"]||window[c[a]+"CancelRequestAnimationFrame"]}if(!window.requestAnimationFrame){window.requestAnimationFrame=function(h,e){var d=new Date().getTime();var f=Math.max(0,16-(d-b));var g=window.setTimeout(function(){h(d+f)},f);b=d+f;return g}}if(!window.cancelAnimationFrame){window.cancelAnimationFrame=function(d){clearTimeout(d)}}}());

$(function() {
  // duplicate headers so we can fold them
  $('.foldmenu-header').each(function() {
    var $this       = $(this),
        perspective = $('<div class="foldmenu-perspective"></div>'),
        foldTop     = $('<div class="foldmenu-fold__top"></div>'),
        foldBottom  = $('<div class="foldmenu-fold__bottom"></div>');
    $this.replaceWith(perspective);
    
    perspective.append(foldTop);
    perspective.append(foldBottom);
    
    foldTop.append($this);
    foldBottom.append($this.clone());
  });
  
  var items = $('.foldmenu-item'),
      status = {
        action: 'none', // action in ['none', 'expand', 'collapse']
        current: null, // current in [null, 0, 1, 2, 3] - index of currently expanded item
        next: null, // next in [null, 0, 1, 2, 3] - index of next item to expand
        time: 0 // 0 <= time <= 1
      },
      el = {
        sub: null, // currently expanding/collapsing submenu 
        top: null, // currently folding elements
        bottom: null // currently folding elements
      };
  
  var $app = $('.app'),
      foldmenuOpen = false;
  
  // click events
  $('.open-foldmenu').on('click', function() {
    (foldmenuOpen = !foldmenuOpen) ? $app.css({left: 112}) : $app.css({left: 0});
  });
  
  $('.foldmenu').on('click', '.foldmenu-perspective', function() {
    if (status.action !== 'none')
      return;
    
    var item = $(this).parents('.foldmenu-item'),
        index = items.index(item);
    
    // set animation status
    if (status.current === null) {
      status.action = 'expand'; // nothing to collapse
      el.sub = $('.foldmenu-sub:eq(' + index + ')');
      el.top = $('.foldmenu-fold__top:not(:eq(' + index + '))');
      el.bottom = $('.foldmenu-fold__bottom:not(:eq(' + index + '))');
    } else {
      items.eq(status.current).removeClass('active');
      
      status.action = 'collapse'; // collapse current first
      el.sub = $('.foldmenu-sub:eq(' + status.current + ')');
      el.top = $('.foldmenu-fold__top:not(:eq(' + status.current + '))');
      el.bottom = $('.foldmenu-fold__bottom:not(:eq(' + status.current + '))');
    }
    if (status.current !== index)
      status.next = index; // expand next (after collapsing current, if any)
    // start animation
    status.time = 0;
    requestAnimationFrame(animate);
  });
  
  // animation loop
  function animate() {
    // increase timer
    status.time += 0.07;
    if (status.time > 1) {
      status.time = 1;
    } else {
      requestAnimationFrame(animate);
    }
    
    // ToDo: DRY!
    
    if (status.action === 'expand') {
      var margin = fold(60 * status.time);
      el.sub.css('height', 3 * margin + 'px');
      
      if (status.time == 1) {
        status.action = 'none';
        status.current = status.next;
        status.next = null;
        status.time = 0;
        
        items.eq(status.current).addClass('active');
      }
    } else if (status.action === 'collapse') {
      var margin = fold(60 * (1 - status.time));
      el.sub.css('height', 3 * margin + 'px');
      
      if (status.time == 1) {
        if (status.next !== null) {
          el.sub = $('.foldmenu-sub:eq(' + status.next + ')');
          el.top = $('.foldmenu-fold__top:not(:eq(' + status.next + '))');
          el.bottom = $('.foldmenu-fold__bottom:not(:eq(' + status.next + '))');
          
          status.action = 'expand';
          
          requestAnimationFrame(animate);
        } else {
          status.action = 'none';
        }
        
        status.current = null;
        status.time = 0;
      }
    }
  }
  
  function fold(deg) {
    var gap = Math.ceil((1 - Math.cos(deg * Math.PI / 180)) * 112);
    
    el.top.css({
      marginBottom: -gap + 'px',
      transform: 'rotateX(' + -deg + 'deg)',
      opacity: 1 - 0.0017 * deg
    });
    el.bottom.css({
      transform: 'rotateX(' + deg + 'deg)'
    });
    
    return gap;
  }
  
  // trigger initial click
  setTimeout(function() {
    $('.open-foldmenu').click();
  }, 500);
  setTimeout(function() {
    $('.foldmenu-perspective:eq(0)').click();
  }, 1000);
  
  // update time
  $time = $('.phone-time');
  function updateTime() {
    var current = new Date();
    $time.text(current.toTimeString().slice(0, 5));
    setTimeout(updateTime, (60 - current.getSeconds()) * 1000);
  }
  updateTime();
});
!
999px

Console