About.com: 20th Century History
Photographs of the Great Depression.
Franklin Delano Roosevelt Library Photos
Library of Congress: “America from the Great Depression to World War II: Photographs from the FSA – OWI, 1935-1945”
These are the famous photographs that you know—Dorothea Lange, etc.
Library of Congress: “Voices from the Dust Bowl”
Audio and photographs from the Library of Congress.
Picturing the Century: The Great Depression and the New Deal
Online photos from a small collection at the National Archives and Records Administration.
FDR Cartoon Archive
Political cartoons from the presidency of Franklin Delano Roosevelt.