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.;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.

[edit:gorn]fixed url[/edit]