Nvidia has released a new Beta
Forceware 177.92 driver for Windows XP and Vista. These drivers are for GeForce 6, 7, 8, 9 and 200 series graphics cards. These drivers provide support for Nvidia PhysX and include a new 8.08.18 PhysX driver as part of the package. Importantly, aside from a range of fixes, the drivers have notable performance improvements in a range of games including Assassin's Creed, CoD4, ET:QW, CoH and BioShock, particularly in DX10 mode, both in single card and SLI configurations.
These drivers are awesome! I'm seeing big improvements in DX10 titles..