* Alt+middle click sends the active window to the background.
* Ctrl-Alt-Plus or Ctrl-Alt-Minus- changes screen resolution (higher/lower). Only if X-Windows server is configured for multiple resolutions.
* Ctrl-Alt-Backspace - kill restart X-server. '''Running applications will be terminated.''' So much faster than typing <code>/etc/init.d/kdm restart</code>
* Ctrl-Alt-Escape - xkill - click an application to kill it.
* Ctrl-Shift-Num Lock will turn the keypad on the keyboard into the mouse, so you can control the mouse from keyboard. Keys / and * on the numpad select left mouse click and right mouse click respectively. Mouse click is done by 5 on the numpad.