Lifesign
A searchable collection of high-quality, copyright-cleared video and animation clips in a range of Life Science categories, including Biochemistry and Medicine. Rather than being downloadable, the clips are made available as streaming video for incorporation in websites, VLEs, presentations, and so on. You choose a video to use, and bandwidth required, then you receive a URL to link to. Browsable and searchable by category.
Creative Commons Video
http://creativecommons.org/video/
Search for video, browse collections of Creative Commons movies and videos including ones you can use commercially or only as derivatives in other works.
Prelinger Archives
http://www.archive.org/details/prelinger
Over 1,000 public domain films from the worlds of government and advertising.
Open Source Movies at Internet Archive
http://www.archive.org/details/opensource_movies
Hundreds of licensed films uploaded by users of the Internet Archive.
New Global Video Project
http://www.ngvision.org/index.en.html
New Global Vision is a digital video archive project. The goal is to build up a network of dedicated ftp servers and a peer-to-peer file sharing system able to overcome the bandwidth problems related to the size of video files. Videos are downloadable on tape or cd in vhs quality (compressed with mpeg1 or divx codec) and represent an expression of issues raised by the global movement against corporate capitalism, a critical glance on reality, a free speech & indypendent information product.
Legal Torrents
http://www.legaltorrents.com/index.htm
LegalTorrents is a collection of Creative Commons-licensed, legally downloadable, freely distributable creator-approved files, from electronic/indie music to movies and books