Today's Commercial Appeal has a story about a photo archivist at the Memphis office of the U.S. Army Corps of Engineeers who has made over 600 images of Memphis and Mississippi River history digitally available to the public, free and unlicensed. There are still over 59,000 more images to archive! The images being released are mostly of Riverside Drive in the early part of the century. It's a good article and the pictures included are impressive. It doesn't seem that any pictures are online yet, except those on the CA website, but they are available from the Corps office downtown for a very small fee.
I just tried to Google the Corps website, but couldn't get a DNS for Google! Very weird. I'll try later and post the links then, so check back tomorrow.