The Female Brain
I found this book better than expected. I know that some people see her ideas as neurosexism, pseudoscience (or just bad science), but despite all of its flaws, the lesson of this book is extremely important. Women's perception of reality changes from day to day under the influence of hormones. Forget the biological determinism, nature vs. nurture dilemma, and concentrate on what's important - knowing your biology helps you understand yourself!