Dan Kahneman, Richard Thaler and Dan Ariely have both published some popular books on the subject. Thinking Fast, Thinking Slow just came out last year. Predictably Irrational came out a few years ago. Nudge (Cass Sunstein and Richard Thaler) looks at the implications of behavioral economics for the law. There is a good summary article of that work here: http://www.law.harvard.edu/programs/olin_center/papers/pdf/2....
I personally think this work is pretty earth-shattering in the field, and that the above work is a must-read for anyone interested in economics. The engineer side of me is really attracted to the fact that behavioral economics uses legitimate experimental methodology, instead of mathematically-supported handwaving. And the implications of the work really turn some of our assumptions about the nature of the economic system on their head.