Academic Earth offers FREE video courses and lectures from the world’s leading scholars. There are over fifteen hundred videos from MIT, Stanford, Berkeley, Harvard, Princeton, and Yale.
Films on Demand offers streaming videos on a variety of topics. Hint: click on the "Citation" tab to reveal the citation to cite in your work. When accessing the databases from off campus, you will be asked to input your MyPima username and password.
Some astronomy videos are (there are many, many more):