http://www.washingtonpost.com/blogs/answer-sheet/post/is-khan-academy-a-real-education-solution/2012/07/12/gJQAtApceW_blog.html
I like Marion Brady's three ways of thinking about learning: (1) first-hand, autonomous, and curiosity-driven; (2) shared experiences and the dialogue it creates; and (3) delivered information. Much of our education system has relied on (3), and Khan Academy is no exception. As Brady says, "Yes, Khan is good. In the kingdom of the blind, the one-eyed man is king."