Apple has officially announces at [WWDC 2012]( that AirPlay mirroring will be coming to the Mac in OS X Mountain Lion.

You can now stream all your content straight from any Mac running OS X Mountain Lion right to your Apple TV wirelessly. The possibilities for this are really endless and should afford a whole new way for people to use their Macs.

AirPlay mirroring has been available for iPhone 4S, iPad 2, and new iPad under iOS 5 but has yet to make its way to the Mac until now. You'll be able to stream movies, music, games, and more straight from the screen of your Mac to your big screen via your Apple TV 2nd or 3rd generation, no cables or adapters required.

Snow Leopard and  Lion users will be abel to take advantage of Air Play mirroring all for a very reasonable  upgrade price of $19.99