By the way, for anyone interested in trying out thp's setup (but, sadly, without the polish of his python-script-enhanced version), you'll need the following three packages:

• xserver-xephyr (to put the secondary window manager over OS2008)
• wmaker (the Window Maker desktop)
• xvkbd (the "movable" virtual keyboard shown in the demo)

Write a script similar to the one under "Xephyr Method" in this post, and then have fun.