I really love what is being done here so far, especially the voice overs and live code editor, but I think it might be helpful to first-time visitors to put some more of that info on the khanacademy.org/cs page as well.

Right now, at first glance it just looks like the Khan "Computer Science" curriculum is solely about learning how to make drawings and animations with processing.js. It can be a bit confusing to the first-time visitor, who might be asking "What is this page going to teach me exactly?".