llebrekniT- Passporter is about the only one of the guides that truly publishes in the year the book is dated (barely). Their 2004 edition will be out in early 2004, I think late Jan. of Feb.
I think this gives them the advantage of being a little more timely than the others.
For anyone who has never bought a WDW guide, Birnbaum's is certainly the prettiest, (lots of great pictures since it is unofficially sactioned by disney) also the best known and IMHO by far the best!
I just bought my first Passporter. Our next trip is not until May 2004. Can I buy updates for my deluxe edition? What are they called and how much do they cost?