Zephyr is awesome multitasking swipes for your device.
Swipe up from the bottom of the screen to close apps.
(Perfect for a broken home button!)
Switch apps simply by swiping left or right from the edge.
Smoothly swipe up to see your multitasking switcher.
The best way to really multitask.
See below for screenshots and videos.
Zephyr fully supports iOS 5.