100 Things Every Designer Needs to Know about People

Good book with lots of interesting facts. I especially like the ‘Takeaways' box at the end of each one of the 100 Things. In these boxes, the author gives advice on how to use what she said on that topic but relates it to the web design area (which is great, so you don't have that feeling: ‘yeah... this is great and all, but how does it relate to me doing websites and making people like them?').

All in all, I recommend reading it, even if you only end up using the knowledge you gathered from it to impress at dinner conversations with random interesting facts.