THE ONLINE BOOKS PAGE

The Online Books Page is a website that facilitates access to books that are freely readable over the Internet. It also aims to encourage the development of such online books, for the benefit and edification of all.
Major parts of the site include:

• An index of over one million online books freely readable on the Internet
• Pointers to significant directories and archives of online texts
• Special exhibits of particularly interesting classes of online books
• Information on how readers can help support the growth of online books

http://onlinebooks.library.upenn.edu/