I didn't see this before, but Flickr and the Library of Congress have teamed up to provide access to more of the photos and artifacts available at the Library of Congress. From The Commons site:
"Back in June of 2007, we began our first collaboration with a civic institution to facilitate giving people a voice in describing the content of a publicly-held photography collection, The Library of Congress. The pilot project we created together launched on January 16, 2008.
The key goals of The Commons are to firstly give you a taste of the hidden treasures in the world's public photography archives, and secondly to show how your input and knowledge can help make these collections even richer.
You're invited to help describe the photographs you discover in The Commons on Flickr, either by adding tags or leaving comments."
I'm on a mission now to get access to Flickr back at school! Watch this space.