Olivia Judson’s piece The Selfless Gene in The Atlantic is a pretty good survey of the various theories of the evolution of altruism. If you read Narrow Roads of Gene Land or Natural Selection and Social Theory, nothing new, but if you aren’t familiar with the lay of the land it’s worth checking out. But you can’t find it free online, so you’ll have to get a subscription to The Atlantic or run out to the book store and sneak a peak.
