I'm the unlucky owner of an SAPPHIRE HD2600 pro AGP card. I bought it in January And I was only able to partially use it since the last driver release.
I mean partially because even if Compiz and video rendering is good. The gaming performance of the card is so low that my Old radeon 9800 pro card put it to shame! And I bought this particular card because I wanted to play the game ETQW. And of course I also wanted to play my other game like Quake4 and Doom3 at higher quality setting and resolution.
Since this card is pretty mainstream I reasonably expected that the Linux driver would fully support this card.
PS: BTW there is a tread dedicated to the HD2600 AGP card on this forum and we are all waiting for an answer from AMD concernig official support for those card.