The latest beta drivers and the first in the 290 series have been released by NVIDIA today, supporting all graphics cards since the venerable 6-series. Their main new feature are official support for enabling ambient occlusion settings in the control panel separately for specific games and enabling NVIDIA Surround on the new X79 SLI-certified motherboards. Ambient occlusion (AO) is settable for uber-popular games The Elder Scrolls V: Skyrim and Call of Duty: Modern Warfare 3. So, what does AO do? We'll let Andrew Burns of NVIDIA explain:

If you're unfamiliar with Ambient Occlusion, it is most easily described as a way to make in-game shadowing more realistic, and therefore better.

What he doesn't say of course, is how it kills your frame rate, especially on lower end hardware. Anyway, there's all the usual goodies in this release: 3D Vision game profiles for games such as MW3, Diablo 3 & LEGO Harry Potter: Years 5-7 (yes really). There's a HD audio update and nine fixes too, including one for random flickering of the Windows boot logo as it's loading or fading away and a fix for the mouse cursor flickering and shaking in games such as Crysis 2 & Deus Ex when SLI is enabled when using 3DTV Play. The NVIDIA product release page is here and they have a snazzy-looking driver selector here. The release notes follow.