Google Enhanced 404 Pages

Anyone tried this out yet? I'm thinking of adding it to my already custom 404 page...

Via webmaster tools...

Code:

<style type="text/css">
  #goog-wm { }
  #goog-wm h3.closest-match { }
  #goog-wm h3.closest-match a { }
  #goog-wm h3.other-things { }
  #goog-wm ul li { }
  #goog-wm li.search-goog { display: block; }
</style>
<script type="text/javascript">
  var GOOG_FIXURL_LANG = 'en';
  var GOOG_FIXURL_SITE = 'YOUR SITE';
</script>
<script type="text/javascript" 
    src="http://linkhelp.clients.google.com/tbproxy/lh/wm/fixurl.js"></script>

yes, i use it. i posted a how a while back along with my tag cloud hack for 404.