AMD's Tom Stellard has published the latest series of patches for bringing up the GPGPU compute infrastructure in their open-source R600 Gallium3D driver.
The latest R600g Compute patches can be found on the
Mesa-dev mailing list.
These latest patches won't enable OpenCL/Compute within the driver for end-users, but is a prerequisite for that ultimate milestone. Other recent work includes
merging the LLVM shader compiler and
the Clover work getting ready.