Man, I'm going to job. Sucks for me! :P
We talk tomorrow, if you still have problems, now I'm ready to run.
A quick note: if you try to use "--enable-gallium-radeon", it's fine to remove the Radeon X.org driver, because the DDX is provided (and override) this thing.
Another idea, verify TO BE SURE (Google it), wich 3D driver use your video card. We should be sure that is R300.
BTW, even the things not works fine, now you have a software render 10 times faster. That's can be called some "good bad news", right?