Navigation Gestures

Gesture	Action
Swipe left/right with 2 fingers	Go back/forward in Safari and Finder
Swipe up with 3 fingers	Mission Control (see all open windows)
Swipe down with 3 fingers	App Exposé (see all windows of current app)
Swipe left/right with 3 fingers	Switch between Spaces (virtual desktops)
Pinch with 4 fingers	Launchpad (see all apps)
Spread with 4 fingers	Show Desktop