I love this technology.  If I had a golden speaking voice, I would love to record dozens of lessons of this manner.  I think the main difficulty with the WRSC is that it has broad objective.  Not overly broad, but when you start with the idea of basically rebuilding the entire energy infrastructure, you're going to have to start with basic principles and work your way up.  Khan has a real gift of starting slow and showing the basics and then slowly developing into more and more complex ideas.  And he presents the ideas like building blocks and encourages you to go and "not take my word for it, play with these equations yourself".  I think this is a big difference from most online training programs (and most learned methodologies) that will mindlessly drill a factoid into your head seventeen times and then marks you down if you dare to deviate from the pre-programmed track.  Worse yet, you learn the factoid without learning the tools necessary to develop your factoids or challenge the underlying assumptions underneath them.

I think what is missing, and I hope it is just that this technology is just starting, is the interaction.  At the moment, the interaction is kinda limited.  If you're stuck or you need to refresh your memory, you can replay.  If you're having a good day, you can breeze through a couple of hours of lectures.  Granted, this is much better than having a live teacher who gave the same lecture for several years and really doesn't want to stop to help one kid who has trouble focusing on a boring lecture or the professor's thick accent.  But I really hope that in the future, the lectures can be more interactive.  If the student wants to put a moratorium on nuclear power, can he make up the difference in geothermal?  What would a hydrogen economy look like compared to say an all-electric one?  What are the tradeoffs?  Can we replay the scenario based on starting in 2020 rather than 2035?