What an idiot. I completely forgot to reread this thread before we left, so we didn't make it to Islands of Adventure, didn't make it to the Earl of Sandwich (or make PB&J's!), and didn't check out the arcade.

We ended up going December 30th through January 8th. At the beginning, it seemed like it was going to be way too much time, but it moved along nicely after that. Even with that many days, we still didn't end up doing everything we wanted, though that had a lot to do with sleeping in late and general slackitude. By staying at a Disney property, we were able to take advantage of the extended park hours, which was nice.
Day 1: Magic Kingdom; Downtown Disney at night
Day 2: Magic Kingdom; Epcot for New Year's Eve
Day 3: Epcot
Day 4: MGM (sucked)
Day 5: Animal Kingdom
Day 6: Downtown Disney; Magic Kingdom
Day 7: Magic Kingdom; watched football
Day 8: Kennedy Space Center
Day 9: Typhoon Lagoon; boardwalk at night
Day 10: Animal Kingdom
My favorite ride: Buzz Lightyear. It's basically a giant video game.
Wife's favorite rides: Everest and Aerosmith rollercoasters
The weather was 50-50. First day was nice, then it rained for a couple of days, then it was freezing, then it warmed up the last 3 days. Definitely didn't pack enough warm clothes.
The fireworks show at Epcot on New Year's Eve was incredible.
Food prices were ridiculous, so I'm very glad we bought the dining plan. I think it cost around $700 (hard to tell since it was all part of a package), and we ate well over $1000 worth. The only problem is that it was actually too much food, especially the desserts. You got one with every meal. Quality was mixed.
Transportation was good. The buses ran often, but I was surprised how far away from everything we were, even while staying at a Disney hotel. We rode the boat a couple times too, which was pretty cool.