The ideological belief in complete freedom of speech and thought, that individuals are absolute owners of their lives and, by virtue of free will, are free to do what they wish with their bodies and themselves as long as they allow others the same freedom.
Regular Websites
Internet Encyclopedia of Philosophy: Libertarianism
Peer-reviewed academic resource puts forth this in-depth article about libertarianism, including various summaries of the diverse schools of libertarian thought. - Internet Encyclopedia of Philosophy: Libertarianism
http://www.iep.utm.edu/libertar/
Outlines the political philosophy as well as the so-called "liberty movement." Also contains an essay about whether libertarianism is conservative or liberal policy. - Libertarianism
http://www.libertarianism.com/
The Basics of Philosophy: Litertarianism
This site, which categorizes schools of philosophy by branch, presents an essay about what principles are common to libertarians, what the philosophy is about, and the history of the school of thought. - The Basics of Philosophy: Litertarianism
http://www.philosophybasics.com/branch_libertarianism.html
Repository for articles and essays by and about libertarian thinkers, including Judge Andrew Napolitano, Daryl Luna, and Pat Buchanan. - The Humble Libertarian
http://www.humblelibertarian.com/
The Institute for Humane Studies posts information about the definition of the libertarian school of political thought. It does so using videos as well as the written word. - What is Libertarian
http://www.theihs.org/what-libertarian