Films on Demand contains over 28,000 educational films, documentaries, and news clips.
Academic Video Online contains news clips, documentaries, and some feature films, as well as musical and theatrical performances. They also have a new tool to add interactive assignments to their videos.
Artstor, now part of JSTOR, contains millions of fine art and architecture images. Excellent for art history research, or just finding amazing photographs. It generates citations, too.