The latest issue of College and Research Libraries News arrived this week; one of the reports within was about the Mark Twain Project Online at the University of California. The beta version is now live, and includes more than 2,300 Twain letters written between 1853 and 1880. Eventually, more than ten thousand fully annotated letters will be included in the online archive, along with digital editions of Twain's novels and other works. By 2010, Twain's Autobiography, never before available in complete form, will also be available on the site.
MTPO also offers an excellent and thorough user's guide and a very interesting history of the project.