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Do Not Disturb: It was a pain to have to manually manage all of your application notifications individually and thankfully iOS 6 adds a single Do Not Disturb slider. You can also configure when this Do Not Disturb feature is active, such as at night when you are sleeping.
Clock: The iPad finally gets a clock and from what we heard yesterday Apple is talking with the Swiss Rail Company since it looks like the clock was copied from them. I don't use my iPad as a timer or stopwatch, but it is good to have a world clock available.
Enhanced Facetime: You can now use Facetime over 3G cellular, which means if you have a cellular iPad like me you can now make video calls on the go.