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The telltale yellow Notes app for iOS will now be available on the Mac as well, so all your thoughts, notes, and ideas will sync onto your Mac, iPhone, iPad, and iPod Touch automatically.
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.