From the University of North Carolina at Chapel Hill, a collection of digital videos from many source (Edison Video, NASA, Internet Moving Image Archive, Johns Hopkins & Carnegie Mellon).
Art videos and media art installations, as well as experimental films, films in the public domain, audio recordings of spoken word art and music, and more. An archive of unusual and international media/art.
Searchable wiki of images, video, and more, most of which are under Creative Commons License or in the public domain, so they can be reused and transformed.
Digitized collections of classic media periodicals that are in the public domain-- a great resource for understanding fan cultures and the cultures surrounding film, radio, and television.
Searchable database of TV news of major new outlets since 1968. The collection is located at Vandebilt University, but you can explore the news stories reported by searching and browsing the database. Create a free login to search and request from the database (browsing is available without logging in).
UCLAFTA's channel includes restored films from the archive, digitized for YouTube, as well as videos of events and speakers on film & television history.