The stand up economist, has a post to Paul Krugman's humorous article on the Theory of Interstellar Trade. The Cartoon Introduction of Economics, by Grady Klein and Yoram Bauman is superb. It covers microeconomics. Because of this book, I learned easier ways to teach hard concepts such as marginal decision making. My favorite part of the book was auctions.
About the Author: Mike Fladien is a high school Economics and Law teacher in Muscatine, Iowa. He has been called the EconHacker because he has a talent for explaining Economics concepts in a simple language that anyone can understand.