Multitouch gestures let your fingers do cool stuff on Mac Laptops and the Magic Trackpad. Some of the gestures must be enabled in System Preferences.

Miscellaneous

ActionGesture
Scroll Up/Down/Left/Right2-Finger Swipe Up/Down/Left/Right
Right-Click (same as Ctrl-Click)2-Finger Click
Open & Close Notification Center2-Finger Swipe from the right side of the trackpad
Lookup Word in Dictionary3-Finger Tap on the Word
Open LaunchpadPinch with Thumb and 3 Fingers
Zoom In or Out on the Screen
(Turn on in System Preferences > Accessibility > Zoom)		Hold Control and 2-Finger Swipe Up or Down

Quick Look Work in Finder & Open/Save Dialogs

ActionGesture
Open Quick Look3–Finger Tap on a File
Zoom In or Out within Quick LookPinch Open or Closed

Mission Control

ActionGesture
Open & Close Mission Control3–Finger Swipe Up/Down
Switch between full-screens apps or spaces3–Finger Swipe Left/Right
Show Desktop (Push All Windows Aside)Spread with Thumb and 3 Fingers
(Pinch to restore)
Show all windows in the current app (App Exposé)3-Finger Swipe Down
3-Finger Swipe Up to Exit

Safari

ActionGesture
Go Back/Forward2-Finger Swipe Left/Right
Zoom in (Increase Font Size)Spread (Reverse Pinch)
Zoom Out (Decrease Font Size)Pinch
Smart Zoom2–Finger tap on the content you want to enlarge
Preview a Link3–Finger tap on a link

Calendar

ActionGesture
Go to Previous/Next (Day, Week, Month, or Year)
(Works like Cmd-Left/Right Arrow)		2-Finger Swipe Left/Right

Preview

ActionGesture
Rotate2-Finger Rotate (in either direction)
Zoom In or OutPinch or Spread
Flip through Multiple Images/Pages2-Finger Swipe Up/DownLeft/Right

QuickTime

ActionGesture
Scrub Backward/Forward through the Video2-Finger Swipe Left/Right (or Up/Down)
Exit FullscreenPinch
Enter FullscreenSpread