Another vote for Unofficial Guide. We were there just before Thanksgiving 2003 and it was invaluable. By the time 1 or 2pm hit, we were done with the "majors" in MK and were just waiting on Philharmagic. My In-laws didn't understand the rationale and ended up having to go back another day because the crowds got too bad.
Then again, if you're going off season (our experience was at the end of September for off-season), we really had no need for one and just used it to remember what we wanted to do....