OS X 10.8 Mountain Lion is currently available on the Mac App Store today July 25th .

The current new features include the following plus some more less prominent ones.

  • Messages – replaces iChat to bring full iMessage support to the Mac
  • Notification Center – just like iOS
  • Share Sheets – allows easy sharing of links, videos, photos between apps
  • AirPlay mirroring – send wireless video to an Apple TV
  • Notes
  • Reminders
  • Game Center
  • Dictation
  • Twitter Integration
  • Gatekeeper – anti-Malware app installation guard

OS X Mountain Lion is deeply intergrated with iCloud and iMessage.  The new version of OS X, Mountain Lion, is now available in the Mac App store for $19.99 USD.