has released the newest version of the Radeon Catalyst drivers, the Catalyst 10.6. The new driver supports all the cards in the Radeon HD 2000, HD 3000, HD 4000 and HD 5000 series as well as Radeon HD 3000 and HD 4000 IGPs. In addition to the bunch of performance improvements, the new driver also brings a couple of new features mostly based around video content playback and GPU involvement in it.
The full list of new features include the GPU acceleration of H.264 video content using Adobe Flash Player 10.1, video "De-blocking" support for HD 5000 series cards which reduces blocking artifacts seen in low bit-rate video during playback, Mosquito noise reduction support for HD 5000 series which reduces mosquito-like noise in highly compressed progressive video, official support for OpenGL 4.0 (on HD 5000 series cards only) and Open GL 3.3.
Performance improvements list includes a bunch of latest titles like Batman: Arkham Asylum, Aliens vs. Predator DX 11 benchmark, Company of Heroes, Dirt 2, Crysis Warhead as well as the Unigine Tropics and 3DMark Vantage benchmarks. Most of the improvements are reserved for the HD 5800 Crossfire configurations or the HD 5970 cards in either single or Crossfire mode.
You can find full release notes as well as the driver itself here