we played disney trivia- and the DVD/tv version of it too is fun.
of course i live on this site for info and love reading trip reports to get me in the mood! i listen to DISradio or live365 disney stations at work.
we did a monthly newsletter each month before our trip with trivia and prizes for winning answers (was a party of 14 going).
my mom also had an alice themed tea party and a Peter pan themed party where we had cake, snacks and games (like throw the crocodile in the bucket game for peter pan) and she gave disney dollars for prizes. the kids loved it.