Apple released the latest version of OS X Mountain Lion 10.8. Apple Mac users can upgrade to OS X Mountain Lion 10.8 for $19.99 right now. You can upgrade to OS X Mountain Lion 10.8 for free, if you bought a new Mac book on or after June 11, 2012.

Hit  Download OS X Mountain Lion 10.8. If you are new to Mac family check  How to upgrade to OS X Mountain Lion.