ATI is officially supporting us now, they've just released a new set of drivers 3.2.5, they are somewhat slow compared to the 2.9.x's but there are no half screen issues with them. I have yet to test with a real game (read NeverWinter Nights).
Proof: direct rendering: Yes
OpenGL renderer string: Radeon 9600 Athlon (3DNow!)
They aren't the best but they get the job done. You can get them here. http://www.ati.com/support/drivers/l...p;submit=GO%21 These drivers are for Radeon 8500 - 9800.
Gentoo users do an emerge (r)sync, they're in the portage tree, ACCEPT_KEYWORDS"~x86" emerge ati-drivers
Debian might have them in an apt list.