I listened to the audio version of the new book titled The Long Tail by Chris Anderson. It currently has 4 (of 5) stars from 45 Amazon reviewers and I also enjoyed it. The full title is "The Long Tail: Why the Future of Business is Selling Less of More." It's like selling millions of things for tens of dollars, compared to selling tens of things for millions of dollars. The statistical background for this sort of thing is called a Pareto distribution. For more info, check out the Wikipedia page for the Long Tail, since I'd probably do it an injustice with any explanation of my own. Chris Anderson is the editor of Wired magazine and also has a Long Tail blog.
I enjoyed the case study-ish information, since that put the message into a convenient and understandable context. I didn't enjoy the book's length. I think it would benefit from a little more editing. But I still recommend it for anybody who is interested in the economics of modern commerce.