Conditional resource loading, using Modernizr's yepnope tests, based on viewport size. Placed immediately before the closing head tag in index.php this can be used to load specific resources against reported viewport sizes

Modernizr conditional loading

<!-- Something like this -->
<script>
Modernizr.load({
  test: Modernizr.mq('(min-width:400px)'),
  yep: '<?php echo $this->baseurl ?>/templates/<?php echo $this->template ?>/js/not-small-screen-stuff.js">',
});
</script>

<!-- Or -->
<script>
Modernizr.load({
  test: Modernizr.mq('(min-width:1024px)'),
  yep: '<?php echo $this->baseurl ?>/templates/<?php echo $this->template ?>/css/big-screen.css">',
  nope: '<?php echo $this->baseurl ?>/templates/<?php echo $this->template ?>/css/small-screen.css">',
});
</script>