MouseBeam is an application that allows a user to beam their cursor to the next screen when it is moved against the borders. It also connects all screens in a circular pattern, so that the cursor won't get stuck, and can reduce mouse movement by beaming it to the middle of the screen.
Wineskin Winery creates Mac OS X ports/wrappers for Windows programs/games, with an easy-to-use GUI, integrated Wine, X11 and an installer.
LiquidMac uses a particle system to imitate liquid and responds to laptop orientation.
