Photos To Go
Categories include animals, business, food, people, and sports. View and purchase online from an extensive, searchable database. http://www.photostogo.com/
Magnum Photos
Well-known cooperative agency with offices in London, Paris, Tokyo and New York, founded in 1947 by Henri Cartier Bresson, Robert Capa and others. Site features biographies and bibliographies of all their photographers. http://www.magnumphotos.com/
