It contains a lot of classics, either available in the public domain or under a creative commons licence.
Also have a look at the digital books search index at
http://www.digitalbookindex.com/_sea...ch011t-rev.asp
The Online Books page (one of my favourites) at:
http://onlinebooks.library.upenn.edu/
and, of course, manybooks at:
http://manybooks.net//