As promised by Apple under a day ago, the latest iteration of OS X, Mountain Lion is now available in the Mac App Store. This new update to the Mac operating system includes many new features, such as notification centre, reminders and notes apps, better iCloud integration and much more. Mountain Lion costs around $20 (depending on your locale) and is a 4.34 gigabyte download exclusively from the Mac App Store. We will have a review of this new Mac operating system in the coming hours.