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Facebook integration: Similar to how iOS 5 added Twitter share integration, iOS 6 adds Facebook integration so you can share to your social network.
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.