Classic Libertarian books by classic libertarians in public domain (I.E. "for free" in pdf and html formats.), courtesy of Lew Rockwell, The Ludwig Von Mises Institute, Ludwig Von Mises, Murray Rothbard, and Lysander Spooner. Must reads.
For A New Liberty by Murray Rothbard
Human Action by Ludwig Von Mises
No Treason: Constitution of No Authority by Lydsander Spooner
What Has Government Done To Our Money? by Murray Rothbard
Planned Chaos by Ludwig Von Mises