NVIDIA has released ForceWare 163.69 beta drivers for use with Windows Vista.

Release Highlights:

-Supports GeForce 6, 7, and 8 series GPUs
-Improved compatibility and performance for NVIDIA SLI technology on DirectX 9, DirectX 10, and OpenGL applications.
-Improved compatibility for The Way Itís Meant To Be Played game titles: BioShock, Crysis, Enemy Territory: Quake Wars, Hellgate: London, and World in Conflict.
-Added HD video post-processing for H.264, VC-1 and MPEG-2 HD content on the GeForce 8500 and 8600 series GPUs.
-Numerous game and application compatibility fixes. Please read the release notes for more information on product support, features, driver fixes and known compatibility issues.

Release notes (pdf)

download: Vista 32-bit | Vista 64-bit

NVIDIA homepage