My last three:
Richard's bicycling book. A classic, everyone who's interested in bikes should read it.
Rough Ride by Paul Kimmage - God, how depressing. Makes you think about professional cycling though.
And I'm currently reading the Penguin Book of the Bicycle. Really interesting bit of history, written in the 1970s, with tours of the Reynolds works, and the original Dawes factory, and lots of history generally. All before mountain bikes though.