http://www.nvidia.com/object/winxp_2k_81.85.html

Release Highlights:

WHQL Certified driver.
Adds support for GeForce 6600 VE, GeForce 6150, and GeForce 6100.
Mixed vendor support for NVIDIA SLI.
TV-Out/HD-out support for NVIDIA SLI.
Added support for VSync on Direct3D games when running NVIDIA SLI.
Performance enhancements for dual-core CPUs.
PureVideo high definition MPEG-2 de-interlacing support.
Usability enhancements when connecting to an HDTV.
MicrosoftR DirectXR 9.0c and OpenGLR 2.0 support
For a full list of fixed and known issues please view the Release Note