Will Richardson made the following comment:
This isn't like a textbook or a worksheet or a (fill in your one-dimensional outdated teaching tool here). This is a conversation, (or at least the potential for one) not a monologue or some contrived negotiation of knowledge that ultimately gets tested against what's been written in a textbook somewhere. Teachers who use them well have to be willing to learn new truths about the material they're teaching, and be able to contextualize those truths and make them relevant to their students. (I can hear the groans now.) Welcome to teaching 2.0, which while a lot more fun, is also a lot more work than teaching 1.0. The question is, are we up to it?