More iOS-inspired features are coming to the Mac in OS X Mountain Lion, shipping next month for $19.99.
What's new in Mountain Lion?
A notifications center (look out, Growl!), a reminders app, Game Center social gaming, voice dictation, built-in Twitter, AirPlay display mirroring and iMessaging. Plus "documents in the cloud," an iCloud-powered document storage and syncing service. And a new service called "Power Nap" that keeps your Mac up to date while it's sleeping.
This extends Apple's move to annual OS X updates - also more similar to iOS than Mac or Windows. Since 2003, Apple had updated Mac OS X every two years or so.