The Art of Walt Disney World: From Mickey Mouse to the Magic Kingdom by Christopher Finch is one of the classic Disney books that gets revised fairly often. You have to be careful if you go to purchase one, since there are so many different types of editions. The newest edition to my collection is the Concise Edition. It is only 160 pages, whereas the revised edition is 506 pages.
What I like about the book is that it is a good introduction to the Walt Disney Company and the major areas of entertainment through the years. Animation, live-action, television and the theme parks are all covered.