File this under Coolest Damn Thing I've Seen All Day: The Library of Congress put over 3100 pictures on Flickr:
Library of Congress staff often make digital versions of our popular image collections available online as quickly as possible by relying primarily on the identifying information that came with the original photos. That text can be incomplete and is even inaccurate at times. We welcome your contribution of names, descriptions, locations, tags, and also your general reactions.
It's divided into two different sets:
These vivid color photos from the Great Depression and World War II capture an era generally seen only in black-and-white. Photographers working for the United States Farm Security Administration (FSA) and later the Office of War Information (OWI) created the images between 1939 and 1944.
Welcome to the daily news scene from almost a hundred years ago, as photographed by the Bain News Service in about 1910-1912. We invite your tags and comments! Also, lots more identification information. (Most of these old photos came to the Library of Congress with very little description.)
This selected set of 1,500 photographs is from a large collection of almost 40,000 glass negatives. The entire collection spans 1900-1920 and richly documents sports events, theater, celebrities, crime, strikes, disasters, and political activities, with a special emphasis on life in New York City.
I Propelled this link the instant I saw it, if any propeller heads wish to vote for it.