There's a Kubuntu logo visible in the bottom right-hand corner of the KDE 4 "kickoff" menu. So Klaus must have used Kubuntu's KDE 4 packages.

In order to get compiz-fusion running, I downloaded and installed the latest nvidia driver (v169.12) while running from the live DVD, and let the nvidia installer configure xorg.conf. (I tried installing an earlier version of the driver - v100.14.11 - and installation failed.) Then I used the command

compiz-manager & kde-window-decorator --replace &

from a Konsole window to start compiz-fusion. (For some reason, I couldn't find a way to use Emerald.)

Knoppix has a "switch desktop" command on the Knoppix menu (it's a link to /usr/sbin/restartx), and one of the choices is compiz-fusion. It started KDE with compiz-fusion running, but without a window decorator.

(I don't have any experience with ATI cards, except for the crappy Radeon XPress 200M chipset in my laptop, which requires XGL to run beryl or compiz.)