The Scripps Library at the University of Virginia, through cooperation with various presidential libraries, has been collecting some of the most important presidential speeches in American history. These speeches all have transcripts, and some are available in their entirety in audio or video.
Small non-profit that started out (in 1984) as a conference bringing together people from three worlds: Technology, Entertainment, Design. TED includes the award-winning TEDTalks video site. These videos are released under a Creative Commons license, so they can be freely shared and reposted.
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