Require iOS 5 or higher.
DoubleTap makes adjusting brightness or volume and toggling orientation lock more easier.
Double tap the screen with three fingers to toggle orientation lock.
Double tap the screen then swipe up or down with three fingers to adjust brightness or volume.
This replaces the original three-finger zooming accessibility support.
Don't forget to check out my latest widgets, Overview and Tap to Widgets.
Configure options from Settings.