Last Thursday, David Airlie achieved hardware-accelerated glxgears on an open-source R500 Mesa implementation
based upon the earlier R300 code. This is a big step forward for open-source 3D on these newer ATI Radeon graphics cards, but it's still a work in progress. However, this morning David Airlie has merged his Mesa/DRM work to the mainline DRM branch. This work, previously housed in his personal git tree under the branch "r500-fp", can now be found in the master Mesa/DRM git. His Mesa work (in the "r500test" branch) still hasn't been merged to master as there is more work to be done on that side.