It appears that the r600/r700 AMD/ATI chipsets are finally making some progress on getting hardware acceleration going. So I'll be doing some testing here with them in the future.
As of right now I'm running Fedora 10 and am using the xorg-x11-drv-ati drivers that come with Fedora 10 and they are giving these performance metrics. rpm is xorg-x11-drv-ati-6.9.0-63.fc10.x86_64
gtkperf -c 500 -a
GtkPerf 0.40 - Starting testing: Fri Jan 2 11:46:31 2009
GtkEntry - time: 0.18
GtkComboBox - time: 6.01
GtkComboBoxEntry - time: 5.69
GtkSpinButton - time: 0.43
GtkProgressBar - time: 0.25
GtkToggleButton - time: 0.86
GtkCheckButton - time: 0.61
GtkRadioButton - time: 1.04
GtkTextView - Add text - time: 8.95
GtkTextView - Scroll - time: 1.61
GtkDrawingArea - Lines - time: 1.60
GtkDrawingArea - Circles - time: 4.31
GtkDrawingArea - Text - time: 3.20
GtkDrawingArea - Pixbufs - time: 0.45
Total time: 35.17
glxgears is not hardware accelerated yet.
1071 frames in 5.0 seconds = 214.146 FPS
1075 frames in 5.0 seconds = 214.934 FPS
Also to note that I am running two screens with one desktop across them.