"Caffeine is a tiny program that puts an icon (a coffee cup) in the right side of your menu bar. Click it to prevent your Mac from automatically going to sleep, dimming the screen or starting screen savers. Click it again to go back. Hold down the Command key while clicking to show the menu. The menu now has a sub-menu for deactivating Caffeine automatically after a number of minutes." http://www.versiontracker.com/dyn/moreinfo/macosx/31941 I just downloaded it and dragged it into the applications folder. What could be simpler? Works great!