Guru3D posted a new beta release of Nvidia ForceWare drivers, 162.15. Drivers are available for both XP (32-bit) and Vista (32-bit and 64-bit).
For the XP drivers, release highlights state that it is a Beta driver release, it has improved compatibility for Lost Planet, Microsoft® DirectX® 9.0c and OpenGL® 2.1 support, and numerous game and application compatibility fixes. You can get them here at Guru3D.
As for the Vista part, release highlights are, Beta driver release, driver supports single GPU and NVIDIA SLI™ on DirectX 9, DirectX 10, and OpenGL, Improved compatibility for Lost Planet, Added “Resize the HDTV desktop” underscan compensation option, Added support for Digital Vibrance Control on GeForce 8 series GPUs, and as XP part Numerous game and application compatibility fixes.
The 32-bit Vista Forceware can be found here, and the 64-bit version is here.