Analysis of business, economics, and public policy from the free marketing/limited government perspective. Intelligent, frequent, and fun to read articles you won't find anywhere else. Also has a great forum.
All about the income tax issue. They do an amazing job of explaining statistics about filers vs. non-filers. They are currently offering a $300,000 prize to anyone that can find the law that states American's are required to pay income taxes.
One of the best resources for Austrian Economics. It has a huge amount of free books and articles. If the subject of economics intrigues you, the is the best place to be.