In case no one has yet mentioned, a cool unlock-to-lock feature:
You have to have "Allow Gestures when Locked" to On in Settings>Display.
When the screen is locked, and you swipe up to unlock, without removing your finger, swipe back down all the way and it will lock up again ;)
Great feature to peak at the time, hub, etc, and then close it back up without hitting the top lock button!