As we reported before, iOS 4.3 Beta has added several multi-touch gestures for the iPad. This feature is not enabled by default, and thus needs to be enabled manually. As this is a Beta version of iOS 4.3, this specific feature needs to be enabled via Xcode on you Mac.
Follow this step-by-step procedure to enable multi-touch gestures on iPad, running iOS 4.3 beta:
Step 1: Download iOS 4.3 Beta firmware, and restore it on your iPad using iTunes.
Step 2: Download the latest version of Xcode, and install it.
Step 3: Open Xcode and click on the iPad icon in the sidebar.
Step 4: In this new window, click “Use for Development.”
Step 5: Log in with your Apple Developer user credentials, and wait to get verified. The icon next to the iPad should now turn green.
Step 6: Close Xcode and close the Settings.app on your iPad from the multitasking tray.
Step 7: That’s it! Open the Settings.app again, then the “General” tab. You should now find the “Multitasking Gestures” option. By default this is set to on.
You can now reveal the multitasking tray a 4-5 finger swipe up, return to the home-screen by a 4-5 pinch gesture, or switch between running applications. (via MacStories)