Sal Khan has been teaching via YouTube for over two years and has Bill and Melinda Gates helping him run his Academy. This is a great model for instruction which frees up teachers to be me. Students at Bullis are watching the videos in advance of class to learn the skill, then come to class to practice. The teacher spends his time coaching and helping. Advanced students work ahead and do enrichment.
Great idea. Last week I was at Stone Ridge in Bethesda where the teachers in 7th grade got iPads. They were asking exactly how to do this. I'm trying it now.