1. The Most Dangerous Superstition, by Larken Rose
2. Why Government Doesn't Work, by Harry Browne
3. Economics in One Lesson, by Henry Hazlitt(free online)
4. Atlas Shrugged, by Ayn Rand
5. The Machinery of Freedom, by David Friedman (free online)
6. The Law, by Fredric Bastiat (free online)
7. Our Enemy the State, by Albert Jay Nock (free online)
8. The Discovery of Freedom, by Rose Wilder Lane (free online)
9. The Revolution, by Ron Paul
10. The Creature from Jekyll Island, by G. Edward Griffin
If you prefer lighter reading, here's a whole thread about liberty-oriented fiction.
Recommended reading: The Most Dangerous Superstition, http://www.amazon.com/Most-Dangerous-Superstition-Larken-Ros...