NVIDIA has released the latest beta graphics drivers, 285.27 beta. Included in 285.27 beta are performance increases from those who are running the 280.28 drivers with 400 or 500-series GeForce cards. Performance increases of 5 - 13% are expected in more than a dozen games including Call of Duty: Black Ops, Civilization V, Crysis 2, Dragon Age 2, F1 2010, Just Cause 2, Mafia 2, Metro 2033, S.T.A.L.K.E.R.: Call of Pripyat, and StarCraft II.
GeForce beta 285.27 also sports a few 3D Vision-related changes, such as new game profiles for Aion, Diablo 3, Dead Rising 2: Off The Record, From Dust, Dirt 3 and others. The beta 285.27 also includes support for viewing 3DVisionLive.com and YouTube 3D with SLI-enabled PCs, it also makes windowed mode the default viewing option for 3D Vision Photo Viewer.
Four bug fixes are included for the Windows XP 32- and 64-bit: two are for single-GPU systems and two for multi-GPU builds. The first set are minor software glitches with NVIDIA Update, the other caused a BSOD when playing Adobe Flash content at HD resolutions and then switching to fullscreen mode while the other caused lousy performance in The Witcher 2: Assassins of Kings when using SLI.
You can download the drivers here: