As many of you are doubtless aware by now, Mac OS X Lion includes several new multitouch gestures. To prevent confusion, and help users learn about them faster, Apple has released a new support document detailing the new multitouch gestures and how to use them.
From the support document:
OS X Lion brings you a new way to interact with your Mac. Tap, scroll, pinch, and swipe your way through your Mac with Multi-Touch gestures, directly controlling what’s on your screen in a more fluid, natural, and intuitive way.
The document contains pictures and movie clips to help you learn how to make best usage of a multi-touch trackpad, and should serve as a nice reference for users new to gesturing.
You can read the entire support article, which is rather extensive, at this link.