http://fileforum.betanews.com/detail/Radeon_Omega_Drivers/1086739971/1
omega is the godfather of graphics driver modding.
edit:
i've been using these:
http://forums.guru3d.com/showthread.php?t=238916
for the last week or so. i'm typically a tweakforce (formerly tweaksrus) person, but these have been pretty solid. as in stable. links doesn't really push graphics drivers very hard, but i did download/watch last season's final episode of lost the other night (i didn't watch the last 4 episodes, but now i'm stoked again). the real media file was pretty smooth on my clunker pc.
tweakforce has a modded 163.71 out, so i'll probably try it at some point. my unscientific observation so far has been that tweakforce drivers have better image quality using the same control panel settings.