Warp2search are reporting that NVIDIA have released an updated driver for Windows Vista. v87.45 comes in both X86 and 64bit flavours and is considered Alpha with no display panel or installer.
To install the driver, Vista testers need to run a driver update and select the .inf file. The results vary, personally I find a significant performance increase in Windows Vista, with the Microsoft default driver resulting in "choppiness" and display rendering lag.