Another great book that touches on these topics is Malcolm Gladwell's Blink. There is also a lot of cool stuff in there about making snap judgements and when you can trust those judgements. One of the things he touches on in the book is an online test at Harvard's website that can test your unconscience views on race. If you have a moment you should check it out: Project Implicit. It is kind of similar to the tests given to the school kids in the 20/20 episode.