Now that iOS 5 has been released, it’s easy to enable multitasking gestures on the iPad 1, using the same trick as before for display mirroring.

Edit the /System/Library/CoreServices/Springboard.app/K48AP.plist file and add a boolean key multitasking-gestures in the capabilities dict, and set its value to true. You can add both display mirroring and multitasking gestures to the iPad 1 using this method.

That’s it!

Alternatively you can use Cydia or redsn0w to do this for you.