The Guru of 3D has posted Forceware 185.68 Beta drivers. Use them at your own risk.

This new driver supports GeForce 9-series, 100-series, and 200-series desktop GPUs.

New in Release 185.68:

Optimized performance for the PC game The Chronicles of Riddick: Assault on Dark Athena.

New in Release 185:

Adds support for the new GeForce GTX 275 GPU.
Adds support for CUDA 2.2 for improved performance in GPU Computing applications.
Accelerates performance in several 3D applications. The following are examples of improvements measured with Release 185 drivers vs. Release 182 drivers (results will vary depending on your GPU, system configuration, and game settings):
Up to 11% performance increase in Call of Duty: World at War
Up to 5% performance increase Company of Heroes: Opposing Fronts
Up to 22% performance increase Crysis: Warhead with antialiasing enabled
Up to 11% performance increase in Fallout 3 with antialiasing enabled
Up to 14% performance increase in Far Cry 2
Up to 45% performance increase in Mirror’s Edge with antialiasing enabled
Numerous bug fixes. Refer to the release documentation notes.

Forceware 185.68 Vista 32-bit Beta
Forceware 185.68 Vista 64-bit Beta
Forceware 185.68 XP 32-bit Beta
Forceware 185.68 XP 64-bit Beta