Hardy Heron up to date - Catalyst 8.1 from repo - no Compiz yet due the Xserver 1.4 compat but:

2D capabilities are heavily improved over 7.12 - I test this with Inkscape ( great use of Blur filter )

Also 3D present some very good performance vs 7.12 (visible with the free look) - I tested with Quake Wars, Quake 4 and True Combat Elite.

On Ctrl + ALt + Backspace => Blank screen + Freeze