Here is an interesting site I found called It has a number of academic videos, sort of like academic channels (e.g. UC Berkeley channel) on YouTube, but this site has academic videos from many institutions and individuals. Also, it seems to have partnered with conferences (e.g., NIPS) and university programs (e.g., OpenCourseWare from MIT) to put together many many academic lectures on-line.  Like YouTube, this site seems to let users post their own videos. I am not sure how (and whether) they verify the (academic) quality of the videos. Here is one of the shortest videos I could find so that you can have a taste.

Artificial intelligence: An instance of Aibo ingenuity
by Michael Littman