YouTube is blocked by many corporate firewalls. Companies are worried that employees will waste time watching dumb videos ... well YouTube has moved into the land of relevancy. Welcome to YouTube.Edu. After all, how do you define an educational portal (including search engine) which includes free learning from the likes of Stanford, MIT ... and of course the University of Minnesota (land of the NorthStar Nerd)?! YouTube.Edu also includes many, many other fine academic organizations. Here are just two results from the YouTube.edu search engine:
Thus, whether your interests range from engineering to ancient Greece ... try it out! I'm adding YouTube.edu to the Engineering Learning Wiki.