skippy-xd (Skippy-XD is a full-screen task-switcher for X11.)

Skippy-XD is a full-screen task-switcher for X11.
You know that thing Mac OS X, Compiz and KWin do where you press a hotkey and suddenly
you see miniature versions of all your windows at once? Skippy-XD does just that.
It's most commonly known by Mac OS X's name for it - Exposé.
