The Mises Institute -- entirely open source, because Mises himself opposed the idea of "intellectual" property.
Lew Rockwell's site -- mostly Austrian in nature, Rockwell blogs libertarianly and frenetically.
The Libertarian Standard -- this one's new to me, but it looks promising, and sort of funny in the articles section.
The Cato Institute -- wonder if they'd hire a Ph.D. in English? Maybe as their education consultant?--I could work as a double agent, having infiltrated the academy without turning into a statist.
Thomas Sowell's Spot -- Sowell is good on everything as far as I'm concerned, but especially on education issues.
The Ayn Rand Institute -- Yes, there's a lot of bullshit here, but some good stuff too. Rand is best defending liberty, and pretty shaky when it comes to economics.
Marxists Internet Archive -- because truth only reveals itself as a whole picture. Seriously, there are a lot of great resources here.