Since someone asked, here are my favorite non-business books, if anyone else cares.
1. Zen and the Art of Motorcycle Maintenance by Robert Pirsig.
2. Godel, Escher, Bach: An Eternal Golden Braid by Douglas Hofstadter.
3. The Demon Haunted World by Carl Sagan.
4. The Beak of the Finch by Jonathan Weiner.
5. How We Know What Isn't So by Thomas Gilovich.
6. Against the Gods: The Remarkable Story of Risk by Peter Bernstein.
7. NonZero by Robert Wright.
8. Brainchildren by Daniel Dennett.
9. Guns, Germs, and Steel by Jared Diamond.
10. The Age of Spiritual Machines by Ray Kurzweil.
Four very good books that get honorable mention:
Atlas Shrugged by Ayn Rand – I thought the ending was a little too extreme, but loved it otherwise.
Religion Explained by Pascal Boyer – controversial, and dry in some places, but very interesting.
On Intelligence by Jeff Hawkins – a groundbreaking book that may some day be at the top of my list. But not until the concepts involved have more support. I can't rank it high if Hawkins theory turns out to fail.
Opening Skinner's Box by Lauren Slater – a great book about famous psychological experiments, but one of the few books I can say was actually too short.