Virtual Wall is a tool that confines the mouse cursor to one monitor without needing to turn off or disconnect the other monitors. It can also be set up to cast a 'shadow' on unused monitors until they are completely dark. All of this is easily managed from the menu bar icon, and custom keyboard shortcuts are available for enabling and disabling Virtual Wall without any mouse clicks.
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.
