Taught my lesson on QR codes today!  It went really well.  A couple of teachers did not know what they were, the others had seen them, but had not thought about using them in their classroom.  The primary ed teacher was particularly excited noting that they would be great for centers using the iPads she has available to her.  The math teacher said that it would be good for providing additional support for his lessons.  The teachers also learned how easy it is to create a QR code and that it would not take much additional effort to incorporate them into their lessons.