It took them pretty long but ATI's Catalyst 7.5 drivers are finally available today.
Besides several resolved issues in Windows Vista, the new driver also includes the following features:
DirectX 10 driver support for Radeon HD 2900 XT - single card and CrossFire in Windows Vista.
Support for second generation ATI Theater 650
Performance improvements: OpenGL performance is improved on the ATI Radeon X1950 XTX at high resolutions (1920x1200 or greater) with anti-aliasing and anisotropic filtering enabled. Doom 3 and Quake 4 improves as much as 13-18%, and Prey improves at least 15.6%. The ATI Radeon X1950 Pro and X1650 XT also sees improvements in Doom 3 and Quake 4 of up to 14.1% at higher resolutions with anti-aliasing and anisotropic filtering enabled.