Have you ever wanted your screen saver to appear as a background image? Probably not. But if you like to show off to your Windows-using friends, then this tip can definitely help you out. By typing the following command into Terminal (Applications > Utilities), all on one line, and hitting enter, you will instantly see your screen saver displayed as a desktop background:
To get things back to normal (which you probably will want to do, as many screensavers will put undue load on your processor), either close the Terminal window, press control + C, or restart your computer. If you are running Leopard and have the clock overlay active, it will appear above all windows, which can get a little annoying.
Want more tips and tricks like this? Visit TUAW's Mac 101 and Terminal Tips sections.