Recently the Cato Institute launched Libertarianism.org, a site that is a “resource on the theory and history of liberty, broadly construed.”
It’s a great site, full of videos, essays, and a blog. I recommend starting with the video An Introduction to Libertarian Thought, delivered by David Boaz.
In its introduction, the site explains the importance of liberty and what it means: “Liberty. It’s a simple idea, but it’s also the linchpin of a complex system of values and practices: justice, prosperity, responsibility, toleration, cooperation, and peace. Many people believe that liberty is the core political value of modern civilization itself, the one that gives substance and form to all the other values of social life. They’re called libertarians.”
In the conclusion to the introduction, what libertarians do and the goal of libertarian activists: “Libertarianism is one of the most exciting developments in modern thought. Libertarian scholars address hard problems and propose solutions that are both moral and realistic. Libertarian activists work to defend liberty from its many enemies and to advance liberty to those who have been excluded from its blessings. They seek to liberate individuals and bring about open, free, humane, and prosperous societies. The people of the world have waited long enough to be free.”