ATI, OpenSuSE 11 and Compiz

Apparently the drivers in the openSuSE ATI repo are recent enough to support a reasonable AIGLX/Compiz performance, so no fiddling with the xorg.conf any more, just install the drivers and run sax2.
Compiz can replace KDM at startup: Control Centre -> KDE Components -> Session Manager. Here, you have a choice of window managers. "Compiz" will only work if compiz runs on your systems without extra options (e.g. --no-libg-fallback), which usually isn't the case. I prefer the "Compiz custom" option. To make that work, create a file "compiz-kde-launcher" in /usr/bin/, ~/bin or wherever your system can find it:

#!/bin/bash
sleep 3
wait
compiz --replace --no-libgl-fallback --ignore-desktop-hints ccp & #or whatever options work for you
sleep 1
emerald --replace &
exit 0

The sleep and wait statements are there to ensure that tray apps etc. have enough time to start up and emerald doesn't fire up before compiz is ready. Feel free to remove/change them.
Make the script executable:
# chmod a+x /usr/bin/compiz-kde-launcher
That's it.