Absolutely awesome mod !
Just a word of warning: remember to download your css file so you are working on the latest version of it not the original ! (and presumably if you re-skin you will need to update it again ?)
Anyway if you want to see it in action on a 2-column layout have a look at:
http://www.eyewearsystems.co.uk/xcart/home.php
Many thanks again !!!