This hasn't been brought up yet... but if you've ever dreamed of spending the night in the Magic Kingdom, this may be the night for you. The Magic Kingdom's hours on December 30th are from 7am (EMH morning for one hour) to 5am. (EMH night for 3 hours from 2am until 5am) The park then opens the next day (The 31st) at 7am with EMH, with only two hours in between operating days.
Who's crazy enough to go for it?
And btw, New Year's Eve at the Magic Kingdom takes place on the 30th and 31st... so you'll get the full 360 degree fireworks if you go.