ATI have just released their last set of CATALYST drivers for the year in the 5.13s. This release fully unleashes the embedded AVIVO technology found on their most recent-generation X1K cards, along with some CrossFire tweaks and other bug fixes/minor enhancements.
The official release notes and download links can be found here folks.
Catalyst® 5.13 software suite introduces H.264 hardware acceleration for the ATI Radeon® X1800, X1600, and X1300 product line. H.264 is advanced video coding that provides significant reduction in bit-rate compared to standards such as MPEG-2 and MPEG-4. The ATI Radeon® X1800, X1600, and X1300 products provide hardware acceleration for the playback of high-definition content that is encoded using H.264. Using the Catalyst® software suite 5.13, along with the Cyberlink H.264 decoder available from http://www.ati.com/technology/h264.html provides H.264 hardware acceleration.