- zufall doesn't work if the root-window is hidden by another program like 
  in Gnome or KDE (I don't use a DE, so I'm not interested to fix this. Patches 
  welcome, of course). See zufall-gnome for a workaround.
- How portable is it? Please tell me if you can('t) get it to run under 
  anything else than GNU/Linux!
- UTF-8?
