Carrots and sticks: Procrastination fix? is an excellent post by Daniel Pink that shows, once again, the perils of extrinsic motivation.
I’m adding this short post with the link to his article to My Best Posts On “Motivating” Students. There are a lot of lessons in that article for teachers. And if you want to learn more how I apply those kinds of lessons in the classroom, you might be interested in my new book, Helping Students Motivate Themselves.