How to enable iPad multitouch gestures

http://justanotheripadblog.com/ipad-tips-tricks/how-to-get-those-cool-new-multitasking-gestures-on-your-ipad-with-ios-4-3

http://jaxov.com/2011/04/enable-multitasking-gestures-on-ios-4-3-1-manual-method/