Here's a link to the nVidia driver download page. I've the GTX 295 and the new driver version is 260.99 - downloading and will install later. The claim is that several performance issues in several games have been addressed.
http://www.nvidia.com/Download/index.aspx?lang=en-us (http://www.nvidia.com/Download/index.aspx?lang=en-us)
All went well, and it does seem like the micro stutter that was occasionally present at the highest settings has disappeared. Even when using anti-aliasing and anisotropic filtering, performance was improved.