Yeah, Sowell is great. I had a class in college that used one of his books as a text - "Knowledge and Decisions". It was fantastic, and people in the class (if they weren't stupid and paid any attention at all) had the opportunity to learn how to *think* about how markets work, and about how tampering with them doesn't.
Actually, Knowledge and Decisions may be the most formative book I ever read. In a sense, it changed my life. But, it is a very dense book and requires an effort on the part of the reader to digest. Every sentence in the book is packed with meaning. I have given away a couple dozen copies over the years, but only when I think someone will make the effort to actually read the book with the focus it requires.