Download Magic Trackpad and Multi-Touch Trackpad Update 1.0
This update adds support to Mac OS X for the Magic Trackpad and is required for its use.
It also enables inertial scrolling and the three-finger drag gesture in recent MacBook and MacBook Pro notebooks.
Mac OS X 10.6.4 is required before installing this update.
For more information about this update, please visit this website: http://support.apple.com/kb/HT4254
For additional information about the Magic Trackpad and Multi-Touch Trackpad please visit: http://www.apple.com/magictrackpad