Sesamouse adds more gestures to the Magic Mouse, like real pinch zooming and rotation. It even sends finger positions for advanced multitouch software to use.
What's new in Sesamouse
Version 1.2 moves Sesamouse to the menu bar, and adds configurable swipe actions:
* Converted Sesamouse icon to system menu bar to avoid taking space in the Dock.
* Added options to trigger Exposé, Desktop, Spaces or Dashboard actions for up and down swipes.
* Since beta: made swipe options less opinionated, added note about gestures to preferences window.