Re "books on behavioral finance," generally http://amzn.to/zQso2s is the starting point, followed by the writings of Andrei Shleifer, Richard Thaler, Hersh Shefrin.
Not immediately trading related, but two books that deeply influenced my thinking of how trends in human behavior (and the entire world for that matter) work:
Ubiquity by Mark Buchanan The Tipping Point by Malcolm Gladwell