While NVIDIA still hasn't posted a G80 driver, ATI has upgraded it's suite of drivers for Windows Vista. Anyone with Windows Vista RC2 or RTM can download and install the latest version of Catalyst Beta Driver for Windows Vista, which fixes issues in several games such as Serious Sam 2. It also fixes issues in Windows Media Player, the general installation/uninstallation of the drivers, and Temporal Anti-Aliasing. You can read the full release notes here.

You can download the December 13th version of the drivers here.

AMD/ATI does not reccomend using these drivers on mission-critical systems, does not support them, and says they will only install on a computer with Windows Vista RC2 or later.