Excellent post on the intricacies of external & internal motivation

Kevin D. Washburn is one of the educators I follow on twitter.  He's a fantastic resource and the author of The Architecture of Learning: Designing Instruction for the Learning Brain.  

Dr. Washburn blogs and today's post - Motivation, the Elusive Drive - provides a thoughtful examination of extrinsic and intrinsic motivations.  I encourage you to read it!