Last month right before FOSDEM 2008, the 3D programming documentation for the R500 GPUs (Radeon X1000) series was released. This documentation consisted of a register reference guide for the R500 GPUs as well as a programming guide covering such areas as the command processor, vertex shaders, and fragment shaders. While the register reference guide for the R600 series is still being worked on, for those with older ATI graphics processors, AMD has went back and created a register reference guide for the R300 series.
Already got it. Looks like we're going to get the 3D in there sooner than later. Makes me want to find a bit of time to help with Gallium, it does. Reading up on what the plan is, it sounds like a lot of fun.