Are you starting to use videos from other people? I'd love to see 3rd party content on the site provided it scored well with both students(attention) and teachers(content).
We're trying our best right now to find potentially interesting instructors. There are 2 or 3 people who might be adding content in the near future. YouTube and TeacherTube (and other sites) already exist for anyone to post a lecture. We think our value is in providing a handful of lecturers that really resonate with students. If I had to guess, we'll have 10-20 lecturers in English within the next 5 years.
Try to be careful with this.
I think one of the reasons why Khan Academy is so great is because people know you are creating the videos. We know what to expect before watching a video. I think there is also a sense of a personal connection, people feel comfortable with you.
Of course I hope for the best, and expanding seems reasonable at this time.
