Requires Ios 4 or higher

this adds 2 homescreen icons that can increase or decrease brightness. Tapping the up icon will increase brightness & tapping the down icon will decrease brightness. Tap & hold 'up' icon for 1 second to max the brightness or tap & hold 'down' for minimum brightness. Both the icons can be moved around like other icons.
(thanks to @thejailbreakbay for the icon images)