We have a new tech tool on campus called Video ANT. It is the perfect tool for watching podcast / digital video lectures etc. and using text to respond. You can type in text (notes or critique etc.) so that it plays with the segment of the video you are viewing, both can be seen. This can be extremely useful pedagogically and also as a possible artistic tool.
A university in canada just got some press about a similar feature that they developed that takes it a little beyond that. http://www.campustechnology.com/articles/58803/
One more reason to get all those lectures, visiting artists, guest speakers etc. up onto Media Mill and out to the masses.