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Another new feature added to Safari is the Tab View. If you're using a MacBook Air or Pro, or a Trackpad on the Mac mini, you can "pinch out" and see all the tabs open in a large, snapshot view. The tiles offer live previews so you can switch between pages as things happen.
You can now play a game on your iPhone, iPad, or iPod touch, put it down and pick it up pretty much where you left off. Game Center is now in "Mountain Lion". You can connect with your friends and share your scores on Facebook. You can also see your friend requests and other game details.
Documents in the Cloud allows you to store text documents, pictures, and other content in iCloud and access it from anywhere. No manual uploading required -- simply drag in your files to the window and they will be uploaded to iCloud automatically.