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Notifications to the desktop
The notification options found on iOS devices will now be a part of Mac OS X as well. In Mountain Lion, just like in iOS, you can customize which system and application notifications show up.
Share Sheets make sharing easy
Hit the Share button in many of the Mountain Lion apps, and you'll get options to share what you're seeing onscreen with other people. The sharing feature detects the file type and gives you a list of appropriate sharing options based on that.
As with the Twitter integration in iOS 5, Mountain Lion now has Twitter built in to your Mac. Sign in once to tweet from your apps, receive Twitter notifications, and view your Twitter friends' photos and usernames in Contacts.