The unoffical guide is awesome. I have gone to Disney many times thorough out my life (Floridian), but for this past trip I bought the UG after reading about it on this board. It has great tips and is just a great book to get you in the mood for your DW trip. I would recommend you buy it!!!!
P.S. I had originally went to my library and borrowed the 2001 UG (the most recent copy they had) and then I happend to see the 2006 UG at Borders and noticed how much better it was, so I bought it. I am sure the difference between the 2005 and 2006 UG would not be as dramatic, but I heard the 2006 is layed out better. Plus it's great to be able to take on your trip, in case something comes up you had not thought about.