"Origin of Wealth: Evolution, Complexity, and the Radical Remaking of Economics" is really great Hacker News-ish book about economics. It's the only non-technical book that gets into agent-based computational economics. There's some unfortunate business strategy waffle in the middle but otherwise it's fantastic.

Here's a review of it by the great Herb Gintis: http://www.amazon.com/review/R26IO7AY7JHS8C/