great tips! auto reloading css is perhaps my most favorite timesaver. i add this snippet to a page when in development:

  <script>
    if(location.href.indexOf('file://') == 0 || location.href.indexOf('http://localhost') == 0) {
      var s = document.createElement('script'); s.async = true;
      s.src = 'js/css_auto-reload.js'; s.onload = function() {
        document.styleSheets.start_autoreload(1000);
      };
      document.getElementsByTagName('head')[0].appendChild(s);
    }
  </script>

it uses http://nv.github.com/css_auto-reload/ and updates the page (in place) nearly instantly after i save css in my editor. i use sassy/scss, so i also run "compass watch" in a terminal. it's css tweaking heaven for me :)