The September 11 Digital Archive was organized by the American Social History Project at the City University of New York Graduate Center and the Center for History and New Media at George Mason University. Containing more that 150,000 digital items (emails, photographs, documents, stories and more), the Archive was accepted by the Library of Congress into its collections in 2003.
From the web site:
Our goal is to create a permanent record of the events of September 11, 2001. In the process, we hope to foster some positive legacies of those terrible events by allowing people to tell their stories, making those stories available to a wide audience, providing historical context for understanding those events and their consequences, and helping historians and archivists improve their practices based on the lessons we learn from this project.
Browse: Explore the collection for stories, images, emails, documents, sounds, and videos of September 11
Research: Search, sort, and examine the entire collection
Contribute: Tell your story, add your email, and upload images, documents, and other digital files to the Archive