Hi Lee,
I now have a compliant CSS as well
1. add a few missing px to the /Portals/default.css and comment out a couple of Microsoft Shadow Filters, change all dimgray and dimgrey to #696969 - convert all colour names to lowercase (white etc)
2. Comment out filter in HouseOfNuke css and comment out Mac IE5 hacks (Do all MAC people use Safari Now?)
With Best Regards
Charles