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Apple announced the developer preview for OS X 10.8 Mountain Lion. OS X 10.8 offers a number of new features we’ve detailed before.

InsanelyGreatMac has put together this nice walkthrough video of OS X AirPlay mirroring. That feature allows you to transmit your OS X desktop onto your Apple TV over Wi-Fi:

Meanwhile, CultofMac does a walkthrough of 30 other features in OS X 10.8. Some previously listed, and some new:

Apple surprised everyone this morning with a developer preview of OS X 10.8 Mountain Lion. The new release brings a number of iOS-like features to the Mac, as detailed in this video:

- Messages – new version of iChat with iMessage support
- Reminders – create lists and tasks, synced via iCloud
- Notes – create notes, synced via iCloud
- Notification Center – on screen pop-up notifications
- Share Sheets – share buttons to email, tweet, message, etc…
- Game Center – social gaming center for Mac
- AirPlay Mirroring – broadcast your Mac’s screen to your Apple TV

Apple also released a public beta of the Messages App for OS X Lion users and is available today.

Apple did give some of the media early previews of Mountain Lion, which we suspect may have been the unusual media event that had been predicted. OS X Mountain Lion is available to registered developers today, and will be go on sale in late summer 2012.