To search for videos and films:
Internet Archive Moving Image Archive - https://archive.org/details/movies
The University of Minnesota Library has compiled an extensive list of Open Videos Collection Websites
On Yahoo's advanced search page you can limit results to .edu and .gov and select the format you want.
YouTube has an Education tab
Creative Commons offers a YouTube search feature http://search.creativecommons.org/ and
http://www.youtube.com/creativecommons. Creative Commons also has licensed videos on Vimeo
Bing Video Type your topic AND domain:edu; also consider domain:gov. (Be sure to include AND in capital letters.)
A list of educational video sites from RefSeek
Fagan Finder- not so academic but interesting lists