I've just launched a course publishing platform called Pensieve, and I was looking for feedback / criticisms, as well as tips on how to get some traction.
The platform makes it so that anybody can put together a course with videos, embedded documents, assignments, quizzes, and all sorts of interactive widgets. When they publish the course, anybody else can start studying it in a systematic way. I love the Khan Academy, but there is no reason its as unique as it is - the idea of the company is to truly democratize education by giving individuals the tools for publication.
Specifically, one of the neat thing on the site is a screencasting tool, which lets people talk and draw on a canvas in their web browser (wacom compatible), and records that as a video that they can embed into their courses. There are also browser drawing and audio recording tools as well.
Feedback? Suggestions? Right now, the the biggest work is solving the chicken and egg content generation problem, and getting some initial traction.