Share 'Tips and Tricks'

This Discussion is on Tips and Tricks... PLEASE Post your useful ones here. ALWAYS give credit, and a LINK to the original resource and where you found said resource, preferably by what methods, i.e. "a Google search for 'xubuntu compiz fusion' led me to Vincent's Xubuntu Blog. That's what worked for me when I was trying to set up Compiz Fusion after switching away from GNOME to Xubuntu/Xfce...…