OS X Mountain Lion: The Missing Manual: 
What do you get when you cross a Mac with an iPad? OS X 10.8 Mountain Lion. Its 200 new features include iPaddish goodies like dictation, Notification Center, and Reminders—but not a single page of instructions. Fortunately, David Pogue is back, with the expertise and humor that have made this the #1 bestselling Mac book for over 10 years straight.
got it on 2012-07-29.