[Due to NDA issues I had to remove the URL and images]
Huge push in the JS area. The drupal FAPI did not have enough speed in IE8 which the client required. The load time went from 20 seconds in IE 8 (1-2 in Chrome) to 1-2 in IE 8 once I rebuilt it using no FAPI Ajax just jQuery Ajax directly.
You will also see the http://www.asual.com/jquery/address/ in use as the back button restores your previous searches.
This also pushes Drupal Commerce as the Product page was highly customized.