Well, I did install the driver you recommended and I got 3D acceleration, but I got that with the new driver too. The problem was that the rendering was so extremely slow my whole desktop was totally unusable. It felt like a pentium 1 with 32mb or something. With the older driver you recommeded I got the same problem, so I tend to think it might have something to do with the version of xgl or compiz wich comes with 10.3.
Wich version of the compiz packages ( compiz, compiz-fusion, xgl , etc )do you use ?