Just a couple of photo/multimedia archive resources:

AP/Accunet Multimedia Archive – This resource is an archive of Associated Press photographs from 1844 to the present, audio files of radio broadcasts, text of wire stories (access restricted to Columbia affiliates)

Internet Archive – The Internet Archive is a nonprofit founded in 1996 that provides access to historical collections that exist in digital format (audio, video, software, etc.).  Try the WayBack Machine – remember getting pints of Ben&Jerry’s delivered to your door through http://www.urbanfetch.com?  Step back in time to view archives of websites no longer in existence!