Well i was working on the mini for a friend. My solution to getting the mini to work w/3d is to run Ubuntu on it and then right after get rid of the all the brown . I would have liked to have been able to run Suse10.3 on it, but the user really wanted 3d for compiz. He has since loaded and is running compiz on his mini.

First link for ppc here
http://cdimage.ubuntu.com/ports/releases/gutsy/release/