TED is the latest to directly jump into the education market -- offering something for those looking for online learning, open source edu, uncollege, hack edu, or any other angle on disrupting education. They are calling on top educators to step up and join in with a short lesson to share with the world. TED clearly has some understanding of what video learners want (its why I am videoing my research interviews and other events for remixing later into edu assets). From the Wired Campus column at the Chronicle of Higher Education.
http://campusentrepreneurship.wordpress.com/2012/03/12/ted-releases-educational-videos-wired-campus-disrupt-edu/