Nvidia has released new Forceware drivers for GeForce powered cards, including XP and Vista. For GeForce 7 and older series cards, the drivers are only available for Vista. There's no word on whether or not these drivers will work on older GeForce cards running Windows XP. There are several claimed improvements, support for new 8600, 8500, and 8400 chips, as well as a performance boost. NVIDIA also claims to have stepped up compatibility with Vista and XP on new games.
There were also new drivers released for various Linux kernels
last month if you missed them.