In Pictures: A sneak peek at Apple's upcoming OS X...
iOS comes to Mac OS X
Mountain Lion continues Apple's trend of bringing iOS features to Mac OS X -- in this case the Messages, Reminders, Notes, and Game Center apps, as well as the Notification Center, Twitter integration, and AirPlay mirroring to Apple TV-connected displays. Also, as the first post-iCloud OS X release, Mountain Lion will feature much more thorough integration with Apple's data-syncing service.
In Pictures: A sneak peek at Apple's upcoming OS X Mountain Lion