http://www.mathalicious.com/2012/02/04/khan-academy-its-different-this-time/ Great commentary on Khan Academy by @Mathalicious. He seems to hit all the right points: the task design isn't very good; Erlwanger and Benny showed us how this didn't work 40 years ago; no matter how much we love technology, education remains a human endeavour; and even though Sal Khan is a great guy providing a great resource -- for free -- we must remind ourselves of how much better we can and should be doing.