Full-screen web browser mode for presentations
All those tabs, buttons, and menus on your web browser take up a lot of screen real estate, particularly annoying when you are giving a presentation. With Firefox, Chrome, and Safari (OS X Lion only) you can hide all that junk in one fell swoop. In Firefox and Chrome, look in the View menu for "Enter Full Screen" (Firefox) or "Enter Presentation Mode" (Chrome). In Safari, click the diagonal arrows at the top right of your browser window. To see your menus again, move your mouse to the top of the screen.