The folks at TED talks recently launched TED-Ed to serve the mission “of capturing and amplifying the voice of the world’s greatest teachers.” In addition to developing a library of instructional videos, they’ve just added a free set of tools that allow teachers to create customized lessons from existing videos on TED, YouTube or YouTube for Schools.
http://www.peterpappas.com/2012/04/flip-youtube-video-lesson-ted-ed-tools.html