Found this over on xp-erience...
Looks like those good guys over at TGT Soft have produced a BETA of their Style XP software that will now work with the "newly-leaked-all-over-the-net" Windows XP SP1. As their site says :-
- Style XP for Service Pack 1 is now in beta.
Please download Style XP 1.01 only if you are willing to help test and have also installled Service Pack 1.
Please email problems to email@example.com.
News source: TGT Soft
This is BETA software!, please use caution when installing it on your system