nVidia has a new driver out today, version 301.42. This is the first WHQL-certified driver in the 300 release series.
This update provides WHQL support for the 600 series nVidia cards.
It provides performance improvements for 500 series cards.
There is a whole load of stuff added. FXAA has been improved to be 60% faster at MSAA 4x levels. Adaptive vertical sync has been added. I doubt the SL viewers can use that. Target FPS is included but games have to support it. Does SL? I don’t think so. But, I don’t know. New multi-screen, 3D Vision, and SLI features.