Mac: Large screen? Dual monitors? Just a little bit lazy? Wraparound is a free Mac OS X app that does one thing - allows your cursor to wrap from one edge of the screen to the other - but it does it very well.
It allows your mouse cursor to "wrap" from one edge of the screen to the other. It uses very little resources and can be customised for performance.
You can select which sides of the screen Wraparound will interact with (top, bottom, left or right), and choose how quickly Wraparound will work. You can even disable the wrapping behaviour near the corners of your screen (Expose users will find this particularly useful).
Wraparound [Digital Cow Software]