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