Following the latest iOS 4.3 release, Apple have included a new "secret" feature, exclusive to developers.
New multi-touch gestures, similar to those found on macs, including swiping four/five fingers to the sides to switch between running apps, swiping four fingers up to view all running apps and playback controls at the bottom, and pinching with five [a somewhat awkward sounding movement] to go to the home screen.
These features are in the OS but not readily available to users yet, but they are to developers, if you know where to look.
All you need do is download and install Xcode [free if you know where to look ;] ], run it connected to your iPad, and turn them on!
If you're interested in getting these new features, check out Gizmodo's quick and easy little tutorial on how to apply them.
Either that or if you're on the jailbreaking scene just wait for the latest iOS jailbreak and I'm sure something'll turn up in Cydia soon.