NVIDIA has released ForceWare 158.45 beta drivers for use with Windows Vista.

Release Highlights:

-Improved performance for DirectX 10 version of Company of Heroes
-Improved 3D performance for single GPU and NVIDIA SLI
-Numerous game and application compatibility fixes
-This driver supports the following 3D features:
-Single GPU support
-DirectX 9 support for GeForce 8 series GPUs
-DirectX 10 support for GeForce 8 series GPUs
-OpenGL support for GeForce 8 series GPUs
-NVIDIA SLI support
-DirectX 9 support for GeForce 8 series GPUs
-DirectX 10 support for GeForce 8 series GPUs
-OpenGL support for GeForce 8 series GPUs
-Please read the release notes for more information on product support, feature limitations, and known compatibility issues

Release notes (.pdf format)

Vista 32-bit | Vista 64-bit

NVIDIA homepage