From the 2010 Annual Letter from Bill Gates: Online Learning:
"The foundation has made a few grants to drive online learning, but we are just at the start of this work. So far technology has hardly changed formal education at all. But a lot of people, including me, think this is the next place where the Internet will surprise people in how it can improve things—especially in combination with face-to-face learning. With the escalating costs of education, an advance here would be very timely.
Most of us have had a teacher whose lectures made a subject seem fascinating even though we didn’t expect that it would be. If you are going to take the time to listen to a lecture, you should hear it from the very best. Now that finding and watching videos is a standard part of the Internet experience, we can put great teachers’ lectures online.
A number of universities are already putting lectures online for free....