Associated Press Photo Archive - "The AP Photo Archive contains some 700,000 images, most of which are contemporary photos made since late 1995. Hundreds of spot news and feature pictures enter into the Archive each day, and a selection of historical images are scanned in weekly."
Time & Life Pictures - "Time & Life Pictures represents some of the world's most recognizable imagery. On this website, we offer content from the finest photojournalists, documenting past and present political and cultural events, as well as celebrities and the American experience."