Books about teaching?

Do any of you know of good books about teaching we might add to the list on this blog (I'm almost afraid of the length of the list John Thompson might provide)! We have a couple of items in the sidebar, and they are linked to their Amazon.com descriptions. I'll be happy to look up and add anything you might want to send. You can just post your ideas to the blog, or you can send them to me in an email.