It's a heck of a lot easier collecting bike books than bikes space-wise but I collect both. So I thought I'd start a thread where people could talk about what they think is the best bike book (and why). I'll start. My all time fav is simply entitled "The Bicycling Book" and then subtitled "Bicycling--the best thing man has ever done." Hard to argue with either the title or the subtitle (OK is should have been titled the best thing man or woman has ever done, . The book was published in 1982 by the Dial Press and consists of a bunch of articles by people with a lot of expertise over subjects that they are passionate about. The late Beryl Burton (and if you don't know who she is, you need to google her) gives a great account of what it's like to race as a woman. There's a really fun article by a writer in Finland who tells you how to ride there in the winter. There's a really fun piece on klunkers since this when some enthusiasts in CA were modifying bikes to ride offroad.
I could go on but what sets this book apart is that it is a collective effort (over 100 articles) written by experts and each piece is very short. There isn't any marketing BS; there isn't a bunch of techno speak; it is simply written by people who are passionate about what they are doing and want to share that passion with others.
Edit: this is a link to the book: http://www.amazon.com/The-Bicycling-.../dp/0385276664