Have fun with drivers! On the new build here an MSI HD 2600XXT DX10 compatible card and the Creative Xtreme Audio model sound card have been a world of fun. In both XP and Vista the automatic color management has to be reacticated in the catalyst control center on most boots and in XP the desktop theme set reverts back to the Vista style.
The real fun begins with the Creative model here however where the latest update when selecting XP as the version being run still sees a Vista version of the web updater! Even at the MS update site the optional hardware updates still see a set of Vista drivers installed on XP there. Don't blame it so much on Vista but NVidia, ATI, Creative, and other hardware manufacturers besides the MS update link that is.