The Internet Archive is providing free access to over 60,000 full text electronic books which were scanned from the holdings of the libraries of the Library of Congress. They cover all subject areas from the humanities, social sciences and physical sciences and include many historical out of print items. According to Celia, strengths include historic American government publications, books on the economic, social and political and legal history of the United States and the American civil war. It is possible to search the website or browse. Copyright and technical information is displayed. It is possible to set up an RSS feed of new items added to the online collection.
Found over at Celia's blog.