The Heinemann Fellows: Michael Pershan on a Year of Feedback

http://www.heinemann.com/blog/mp-yearoffeedback/
This post is a great example of a teacher who is willing to be very reflective and self-critical in order to push his students to think more deeply about mathematics. Here, Michael Pershan carefully reviews the kinds of feedback he's given students and dissects the nuances and how they might have elicited different kinds of student thinking.