After a long night wrestling with alfa source code, I’ve managed to install Xgl.
Xgl is a Xorg-X11 layer that uses openGL to achieve some nice stunning effects.
One of these is to be able to switch desktops by pressing ‘Ctrl+Alt’ and dragging your desktop-cube.
There are a lot of other things that I can’t show with screenshots. Take a look at the Xgl release post. These things include that all forms behave flexible. If I drag a form it’s like it’s made of rubber instead of concrete. Also every form pops up gently animated. There’s also a mac osX expose-clone, which is really helpfull.