Moneyball:

Just read this book -- largely because some of my cobloggers have spoken highly of it -- and liked it a lot, though I'm not a baseball fan. To me, this book is about science, psychology, and the power of reason and the scientific method. The story that it tells reminds me of the Royal Society's motto, "nullius in verba," an approach that I much admire (though, sad to say, so rarely emulate, given the limitations of my profession at least as I practice it).