[ame=http://www.youtube.com/watch?v=LjpiAOkU03E]YouTube - Change Brightness In App Switcher On iPhone And iPod Touch Web Browser - iOS Vlog 201[/ame]
With App Switcher Brightness, you can change your brightness on your device, right from your app switcher. Easy and simple to use, just double tap your home button swipe to the right, and you'll find it. A new adjustment bar awaits you to switch your brightness within any app. Check it out in Cydia under "App Switcher Brightness".