American Memory: Sound Recordings
American Rhetoric (speeches)
Classical Music Library - over 50,000 classical music recordings, plus composer biographies and music history
Gutenberg: The Audio Books Project
LibriVox (audio versions of public domain books )
Academic Earth (video lectures)
American Memory: Motion Pictures
GettyImages: Footage (video)
History.com Video Gallery
LearnOutLoud (audio and video)
Wayfaring Map: Stingy Scholar's University Podcasts, Webcasts, and OCWs
University Channel (public affairs podcasts)
American Memory: Photos, Prints
ARTSTOR (Over a million images in the arts, humanities, and social sciences with a set of tools to view, present, and manage images)
GreatBuildings.com: Architecture Design Images
Corbis
Flickr: The Commons (copyright-free images from the Library of Congress, the Powerhouse Museum, and other collections)
GettyImages
LIFE Photo Archive (hosted by Google)
NYPL Picture Collection Online (searchable database of 275,000 photographs and manuscripts)
Oxford Art Online (formerly Groves)
PhotoGraphicLibraries.com
Wikimedia Commons
World Art Treasures (From a slide collection of the Jacques-Edouard Berger Foundation)