Microsoft has just released some update Packs for Windows Vista. These packs fix some very important issues in Windows Vista namely:
3D graphics performance for some games.
File and Folder Copy for large sizes.
Issues when saving AVI files.
These packs are highly recommended for everyone using the the new OS.
Update: After installing the packs and testing some of the claimed fixes I think it is all good however the 3D performance issues are not totally fixed. Mainly my World of Warcraft problems are not fixed :(