Been watching the “John Adams” series on HBO lately? In LibraryThing, you can browse the libraries of John Adams, Benjamin Franklin, and Thomas Jefferson (as well as many other famous folks), thanks to the I See Dead People['s Books] group. These Legacy Libraries are the personal libraries of famous readers, entered by LibraryThing members or batch-imported from various libraries.
WW1: Experiences of an English Soldier is a blog of transcripts of a young English soldier’s letters from the first World War, posted exactly 90 years after they were written. Be sure to check out the “Helpful Hints” in the left sidebar for the best way to catch up with earlier posts.
Shorpy.com is a photo blog about what life was like in the past, from the dawn of photography (in the 1860s) to the 1940s and 1950s. The site is named for Shorpy Higginbotham, inspired by photos of this 14-year-old Alabama coal miner in 1910. Visitors can make comments, and, by creating a free account, upload their own vintage photographs.
The Library of Congress recently posted a webcast about their Flickr project (the FAQ provides technical and other details). Approximately 50 images per week are posted on Flickr from the photo collections. Anyone can add notes (by outlining sections of the photos), comments, and tags to these historical photos. The Library of Congress has used this Flickr input data to change over 100 cataloging records so far.