Windows only: Madotate lets you manage open windows by way of a nifty 3D barn-door effect.
The program adds an extra button to each window's title bar, just to the left of Minimize. Click it and the window swings back like a door. Click anywhere in the window to restore it. You can also assign hotkeys to "swing" the current window or all windows. Madotate supports cool effects like zooming (which you can do with your mouse wheel) and transparent windows (if your video card has the horsepower). It's a really slick little program, though I wish it would remember each window's position: It seems to have a mind of its own when it comes to deciding which direction to swing a window.
Still, if you want a unique way to manage your open apps, Madotate is well worth a try. The program is free; it's compatible with Windows 98, 2000 and XP (not sure about Vista). Note that the link below will download the program directly. Thanks, Tran!
Madotate [via Tutorial5.com]