For those interested in testing Radeon DRI, I've placed a patch located at http://www.unixbox.com/~ajoshi/radeon-dri.diff which whould patch cleanly against recent Ben H.'s kernel. You must turn on AGPgart support, PCIgart isn't done yet.
Also, you will need to replace your /usr/X11R6/lib/modules/dri/radeon_dri.so with http://www.unixbox.com/~ajoshi/radeon_dri.so.bz2 This was tested on a G4 Dual800 w/ Radeon AGP 32MB board, your results may vary, so please include machine specs if you reply. ani