The newly-released NVIDIA 275.50 Beta Driver is now out and includes just a few small changes for two of the latest games, new 3D Vision profiles and the addition of SLI support for compatible AMD-based motherboards:
3D Vision performance in Duke Nukem Forever has been improved when using a 3-Way or Quad SLI setup.
3D Vision in Alice: Madness Returns is now rated as 'Good.'
3D Vision profiles for the following titles have been implemented:
Duke Nukem Forever Demo
Rise Of The Immortals
The use of multiple NVIDIA GPUs in a SLI configuration on SLI-certified motherboards with AMD 990FX, 990X and 970 chipsets has now been enabled, as promised in April.
The new NVIDIA 275.50 beta drivers can be found here.