The new cat’s in town (sorry, I just had to) with a ton of new features.  Here’s a look at some of the best.
1.    Dictation. In System Preferences, turn on dictation, be connected to the internet and you will have a new personal assistant.  You speak and the program will type.  This works on all applications, even if apple did not make it.
2.    You can add text to your pictures from the Preview’s tools section.
3.    A new button allows for the easy sharing of content to e-mail, twitter, i-photo and more.
4.    The computer will remind you of things based upon where you are.
5.    Directly connect to twitter.
6.    Software updates can be automatically downloaded and installed.
7.    Just like on iOS, dashboard widgets can be placed in folders.

For pictures and additional new features go to http://www.businessinsider.com/mountain-lion-tips-and-tricks-2012-7#never-type-another-word-again-1