Radeon =< r200 are supported through XFree-4.3.0.
Radeon >= r200 are supported through Ati's proprietary drivers.
If you do the math, you'll see the r200 are supported by both...
Do a
search on the forum, DaOne has posted a link to Ati's newests, the 2.9.6, which support XFree-4.3.0.
If you're still using XFree-4.2.x, the older 2.5.1 will work, see Ati's regular d/l site.
That's a few options and YMMV with each/any.