Mountain Lion, a new version of Mac OS X that has been unveiled in February, is now available to download from the Mac App Store for $19.99. Mountain Lion comes with more than 200 new features including the all new Messages app, Game Center, Facebook integration, Notification Center, Power Nap Dictation and Gatekeeper. But the coolest feature of Mountain Lion is undoubtedly AirPlay Mirroring that lets you wirelessly send an up-to-1080p stream of what’s on your Mac to an HDTV using Apple TV 2 or Apple TV 3 or send audio to a receiver or speakers that use AirPlay.

With AirPlay Mirroring built into Mac OS, you are able to stream whatever is on your desktop – webpages, photos, videos, presentation – directly to your HDTV, with only one click on an AirPlay icon on the OS X menu bar.

Mountain Lion automatically detects an Apple TV when it’s on the same network and AirPlay icon simply appears in the menu bar. Mirroring sends up-to 1080p video stream with stereo audio. All information sent using AirPlay Mirroring uses encryption.

Game Center

Now that Mountain Lion also includes Game Center, and thanks to AirPlay Mirroring, your Mac becomes a game console! At this year’s WWDC Apple showed a very impressive demo of an iPad and a new MacBook Pro (yes, Game Center for Mac is cross-compatible with iOS) playing CSR Racing head-to-head, with the Mac streaming to a TV with little to no lag.

Apple TV set

PCMAG‘s Edward Mendelson believes AirPlay Mirroring built into Mac OS X could be another evidence that the Cupertino-based company will unveil its own television soon: “Apple of course didn’t say anything about the much-rumored Apple-branded television, but I somehow doubt that AirPlay Mirroring got into OS X only because Apple wanted to sell a few set-top boxes,” he said.

Download Mountain Lion [iTunes link].

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