Airplay Mirroring has been simply but effectively integrated right into the multitasking bar and it’s performance is surprisingly good.
Here’s how to do it:
1. Ensure your Apple TV is switched on and at the home screen.
2. On your iPad 2, access the multitasking bar by either swiping up the screen with three fingers or by double-tapping the home button.
3. Swipe the multi-tasking bar to the right to reveal the iPod/Brightness/Volume/Airplay controls panel.
4. Tap the Airplay button.
5. Tap Apple TV
6. Toggle the Mirroring switch to ON.
This was tested on an iPad 2 running iOS 5 developer edition. These features may change when iOS 5 is released.