AMD has released a new batch of Radeon graphics drivers today, bringing the package up to version 9.3. The update includes a few performance boosts, though it seems the primary focus of this release was bug fixes. Fixes for Aero, power saving states and movie playback were included for Vista. Windows XP saw fixes for video playback and task switching in some games, along with a few application-specific fixes.
For those using Linux there's no updated driver just yet. There is, however, a driver package for the Windows 7 beta, which demonstrates that AMD is actively developing their drivers for the as of yet unreleased version of Windows. You can find the full release notes here (in PDF form) or choose the appropriate OS below to get the latest Catalyst driver release.