The iPad 2?s Killer Feature Is HD Mirroring
People might disagree on whether buying an iPad 2 is a good idea, but there's no denying that it improves on the original. But the most impressive feature of all comes when you combine the iPad 2 with the new Digital AV Adapter accessory: video mirroring.
Source: http://gigaom.com/apple/the-ipad-2s-killer-feature-is-hd-mirroring/