AMD has put up a new CATALYST driver for download if you want to play Rage. This driver is optimized just for Rage, so don't download it if you want to play the Battlefield 3 Beta or other titles.
Significant performance gains for single GPU configurations
Compatible with AMD Radeon™ 6000 and AMD Radeon 5000 series of graphics products
Includes the latest OpenGL driver component for Rage performance optimizations
It's about time the GPU companies buffed up their OpenGL support. I'm surprised that the group behind OpenGL didn't capitalize on the debacle over DirectX 10. They could offer DirectX 10/11 features under Windows XP, but for some reason they do not (not that I know of, anyway).