This is Xgl compiled for AMD Athlon XP processord with optimize level 4. untar it into your root and it will be installed in /opt/Xgl. use this script to execute KDE from a minimal session, preferable without any windowmanager running (called 'failsafe' in KDM):
/opt/Xgl/bin/Xgl :1 -ac -fullscreen -accel glx:pbuffer -accel xv:pbuffer&
DISPLAY=:1 /opt/Xgl/bin/compiz decoration wobbly fade minimize cube rotate zoom scale move resize place switcher water&
works fine with my nVidia Card. this CVS snapshot is of yesterday. enjoy using it :)
Note: Your have to have Xorg 7.0 (6.9 may work, though not testet) and gtk+2.8 and cairo installed.