Graphic Design: Images

General:

• NYPL Digital Collections
  Digitized images from the New York Public Library's vast collections.

• Creative Commons Search
  Search for images that are in the public domain OR have been granted creative commons status.

• ContentDM Collections: Browse
  Look through all the digital repositories in the ContentDM system.

• Hollis Images | Harvard University
  A free online image database.

• Smithsonian Open Access
  Art, science, historical images & more that are public domain/free to use.

Art / Architecture / Design:

• ArtBabble
  Like YouTube, but just art-related videos.

• Cooper-Hewitt Collection
  Digitized collection of the Smithsonian's Design museum.

• Getty Research Portal
  Access digitized art history publications, rare books, and related literature. Like Google Books, but just for art stuff.

• Metropolitan Museum of Art | Collection
  Includes access to 300,000 open access images (labeled as "OASC") 

• Mother of All Art & Art History Links | Online Image Resources
  A list of image sites, organized geographically.

• Visual Arts Data Service (VADS)
  100,000 images free for use in education.

• Video Data Bank
  A site committed to video art & alternative media in the U.S.

• Post Video Art | Streaming Video Art & Experimental Film
  View video art streaming on the web.

• Bridgeman Art

• UbuWeb
  All the avant-garde you can shake a stick at.
   
• Tank.tv
  Set up a user account to access experimental video/video art archives.

History:

• Ad*Access | Duke University
  Over 7000 digitized images of advertisements

• Digital Collections | Library of Congress
  All sorts of cool stuff relating to American visual culture.

• LIFE photo archive hosted by Google
  Photographs from the LIFE magazine photo archive, 1750s to today

Science & Technology:

• Historical Anatomies on the Web | National Library of Medicine
  Historical medical illustrations

• Animal Sound & Video Catalog | Macaulay Library
  A database of animal sounds & videos.

• Classic Illustrated Zoologies & Related Works, 1550-1900
  From the NYPL

• NASA Images
  Photos of the universe, solar system, Earth, and more

• USDA Pomological Watercolor Collection
  7,584 watercolor paintings, lithographs and line drawings of fruits and nuts grown in the United States; all created between 1886 to 1942.

• Medical Artifacts Collection | Virginia Commonwealth University Libraries
  167 images of medical & surgical equipment

• Radio Shack Catalogs
  Every catalog, reproduced online. Amazing diagrams & illustrations!

Popular Culture:

• Network Awesome
  The name says it all.
   
• WishbookWeb.com
  A digitized collection of Christmas department store catalogs.