If you're a Radeon user, you may want to check out the newly released Catalyst drivers that AMD has made available today. AMD released the Catalyst series 8.10 drivers for all major platforms, including Windows XP, Windows Vista, Mac OS X, Linux and the 64-bit iterations thereof. That's a significant amount of driver releases, many of which have platform-specific fixes.
Some of the changes include the Catalyst Control Center having the ability to control the GPU fan. They also fixed some minor display detection bugs. The operating system that got the most attention in this release was Windows Vista with at least seven specific fixes. You can download the drivers immediately from AMD's site.