synaesthesia

I think Freakonomics: A Rogue Economist Explores the Hidden Side of Everything looks fascinating. Here's some details about it from the authors' website:

Through forceful storytelling and wry insight, Levitt and co-author Stephen J. Dubner show that economics is, at root, the study of incentives - how people get what they want, or need, especially when other people want or need the same thing. In Freakonomics, they set out to explore the hidden side of … well, everything. The inner workings of a crack gang. The truth about real-estate agents. The myths of campaign finance. The telltale marks of a cheating schoolteacher. The secrets of the Ku Klux Klan.

What unites all these stories is a belief that the modern world, despite a surfeit of obfuscation, complication, and downright deceit, is not impenetrable, is not unknowable, and - if the right questions are asked - is even more intriguing than we think. All it takes is a new way of looking. Steven Levitt, through devilishly clever and clear-eyed thinking, shows how to see through all the clutter.

Freakonomics establishes this unconventional premise: if morality represents how we would like the world to work, then economics represents how it actually does work. It is true that readers of this book will be armed with enough riddles and stories to last a thousand cocktail parties. But Freakonomics can provide more than that. It will literally redefine the way we view the modern world.

Kottke has an interesting interview with one of the authors here.