My wife and I went to WDW the week immediately after Thanksgiving in 2006. We are now planning on going Dec. 12 - 19th, 2008. Just wondering what the difference (if any) will be in temperature and crowd level?

It can get cooler during that time. Best thing to do is to dress in layers. It can get warm during the day, but once that sun goes down, and/or if there is a breeze, it can get chilly.

You will be going down during a good time. At the same time, you will be there for MouseFest (http://www.mousefest.org/default.asp)as well.