http://www.phoronix.com/scan.php?page=article&item=ati_r500_3d&num=1
After some recent work today, Compiz is now working on R500 graphics cards using the open-source xf86-video-ati and the latest Mesa git. In addition, the Unreal Tournament 2004 demo is even running! There is now parity between the open-source R500 3D support and the level of Mesa support for the older R200/300/400 generations! This is one hell of a milestone.