If you listen to Sal's talks or read some tesimonials, you will find it is a very real part of education already. I hope the work of Khan Academy keeps growing organically on its own merit and is not institutionalised in anyway.
I have not done either of those. I did watch a couple of his math videos on the site. It just so happens that we are teaching our son math this year. What great timing for this post. The videos were very good. I had my son watch the the "Division 1" video for a bit and he was tracking with it very well. Kudos to Khan Academy.
Ivan Illich, in his writings on Deschooling Society, would have been immensely proud - especially once this gets truly p2p. Being able to get an education, without being institutionalised, on demand not force-fed - what a beautiful counterpoint this will become to traditional education. If kids went home to this and every morning/evening did some collaborative community service of some sort - so that they learn to socialise - how much better off society could be!