So first I really just need to throw it out there that I've been reading the Thinblade series by David A Wells and if you love fantasy with tons of libertarian philosophy thrown in I highly recommend it, and the first 2 books are free on Kindle so you can't really go wrong there.
Here is a list of a few more standard books I recommend:
The Libertarian Mind by David Boaz
You can also find Libertarianism a Primer by Boaz for free here.
Consider The Law by Frédéric Bastiat.
You can find it free here.
The Machinery of Freedom: Guide to a Radical Capitalism by David Friedman
Find a second addition copy free of charge here.
My road to libertarianism admittedly started with this Dystopian fiction:
Atlas Shrugged by Ayn Rand
Found free online here.
America's Great Depression by Murray Rothbard
The Road to Serfdom by Frederich Hayek
I'm sure I'm missing some on my list. What books do you recommend?