bridgman talk something about a release in august for the mesa r800 3D part.
what do you mean with tweaking and compiling??? in my point of view the catalyst isn't ready for ubuntu 10.10 right now.
but on 10.04 you can install it and use it yes there are known bugs i thik they try to fix this in 10-8
i really don't understand you in the nvidia point if you don't wana a amd card get an intel gpu thats much better than nvidia!
nvidia is just the lame-duck.