Interesting+Books+for+Teachers

This is mainly for math teachers, but I'll try to list some of the more general books I like first:
 * Kagan's Cooperative Learning (go directly to their web site to get the latest version)
 * Every Minute Counts - great book on how to teach math class. A bit old now, but many ideas are still useful.
 * Proofiness - great, readable book on numbers in our lives. Mostly applicable to statistics, but makes you want to understand math in general better.
 * Drunkard's Walk - great, readable book on randomness
 * 7 Habit's of Highly Effective People (I love this book. I mostly have listened to it on audio, but I've listened to it again and again. One day I'll get it :)