Have you ever been using a graphics intensive program that takes up your entire screen, only to have the Dock get in the way when you tried to change something?  Well, an easy way to solve this problem is to temporarily move the dock.  Instead of doing this through your System Preferences, there is an easier way: simply hold down the shift key and click on the vertical separator on the right-hand side of your Dock (this is the bar that separates the Trash Can from the other applications) and drag the Dock to its temporary home.  To return it, simply perform the same procedure and drag the Dock back to its usual resting place.