I haven't checked out Coursera, but isn't it more of a college course that you can take online? Khan's videos seem much more accessible and are mostly aimed at a high school level. There are many people who browse through Khan's videos who don't have the time, motivation, or ability to take a Coursera course.
I think that basic computer science (or at least basic theory of computation) is at least as important to understand in the modern world as algebra or calculus, and I don't like that it isn't more widely taught. I looked at Khan Academy hoping to find a good introduction for someone and was disappointed when I found that all it had was an introduction to programming.
Coursera is more like college course in that it has lecturs and after that you have 'homework' but its much better then normal college stuff put on the net. It is made for the internet not for offline and thrown on the net.
I think that basic computer science (or at least basic theory of computation) is at least as important to understand in the modern world as algebra or calculus, and I don't like that it isn't more widely taught. I looked at Khan Academy hoping to find a good introduction for someone and was disappointed when I found that all it had was an introduction to programming.