Is there a howto on installing proprietry ATI drivers with opengl support?

I have no problems (in recent times) installing ati drivers/xgl/compiz on ubuntu based systems but having the same sort of problems (as in earlier ubuntu systems) in pclinxos now

I have xgl and compiz going ok (I think) but the ati drivers are not installing (well they install ok, just don't run) so all opengl stuff runs real slow.......

Any obvious solutions