Digital eBook Index

Try this eBooks site which is an index of many of the major ebook sites such as Gutenberg Project, Bartleby, Library of Congress eTexts, NetLibrary, and major university ebook collections in the United States and Great Britain. About 75,000 items are free while others are available for a "modest" cost as downloadable or online books.

Books are divided into subject area categories and the site is easy to search. Take a look at http://www.digitalbookindex.org/about.htm