Radeon 9600 3D support
1 - don't forget to compile your kernel with the following options activated : agpgart, intel-agp, radeon drm
look at the .config file for more information
2 - emerge =xorg-x11/xorg-7.1
3 - after, executing xorgconfig to create your xorg.conf file. DRI support is activated but Render Accel is not present in the lastest Mesa Libs for this graphic chipset.
look at my /etc/X11/xorg.conf file

Add-on : /var/log/Xorg.0.log