ATI R300 Gallium3D DRI Support Is "Done"
This is the first R300 Gallium3D component that is marked as done while the other areas like the EGL, Mesa, and X.Org state tracker support is still being worked on for this new r300g driver. Though "done" doesn't mean that everything is all set for prime-time action with this new driver, but it means that the conformance tests for that state tracker are passing and everything should be implemented.
Corbin has also added the r600g driver status to this page, which will be the Gallium3D driver that will support R600/700 class hardware (Radeon HD 2000/3000/4000 series) and likely R800 Evergreen GPUs (Radeon HD 5000 series) too. The r600g driver though is still extremely early in development and everything is considered a work in progress.