While driving to SF for Macworld, I began listening to an audiobook called Freakonomics, by Steven D. Levitt and Stephen J. Dubner, and I'm really enjoying it.
I suppose I should finish a book before recommending it, but this has already been so enjoyable that I have to give it a plug. It's pretty popular; there's a good chance you seen it or heard of it. If you haven't, this is a book written by an economist and a journalist. It's not a course in micro-economics or anything; it seeks to answer interesting questions ("is there corruption in sumo wrestling?") by considering things like human incentives and distribution of information. There's really no math; any results arrived at by math are explained in a very understandable manner.