DanL was probably trying to say "it works for HD-xxxx hardware", ie r6xx and up.
Yes, I should have capitalized RadeonHD to make it more clear that I was referring to the (R600+) hardware class than the driver. Thanks for the articulation help.
@Qaridarium: KDE 4.4 (released in about two months) does not really use take advantage of OpenGL 2 yet. KDE 4.5 however will shine with OpenGL2/3 and that stuff is already heavily under development.