Wattpad.com ... Wattpad is all about reading and sharing books on your mobile phone. Use a desktop computer to upload and share; user your mobile phone to read anywhere. Mobile Site http://m.wattpad.com/ Full WebSite http://www.wattpad.com/

Manybooks.net There are 22,943 eBooks available here and they're all free! Mobile Site http://manybooks.net/m/ or http://mnybks.net/ Full Website http://manybooks.net/

Gutenberg.org There are over 27,000 free books in the Project Gutenberg Online Book Catalog.
A grand total of over 100,000 titles are available at Project Gutenberg Partners, Affiliates and Resources. http://www.gutenberg.org/

Girlebooks.com As our slogan says, we publish ebooks by the gals. But much more than a simple ebook resource, Girlebooks aims to make classic and lesser-known works by female writers available to a large audience through the ebook medium. http://girlebooks.com/

baen.com Free ebooks in different formats http://www.baen.com/library/

booksinmyphone.com Huge collection of free ebooks for mobile Mobile site http://mobile.booksinmyphone.com/ Full Website http://www.booksinmyphone.com/

etext.lib.virginia.edu Over 2,100 publicly-available ebooksfrom the University of Virginia Library's Etext Center, including classic British and American fiction, major authors, children's literature, American history, Shakespeare, African-American documents, and much more. http://etext.lib.virginia.edu/ebooks/

umnet.com Huge collection of free ebooks for mobile Note You have to register before downloading http://www.umnet.com/downloads/Mobile-Ebooks.aspx

itlibitum.ru pretty good collection of books in text format ... http://www.itlibitum.ru/library/author.en.html

Alex Catalogue Alex Catalogue of Electronic Texts
The Alex Catalogue of Electronic Texts is a collection of about 14,000 classic public domain documents from American and English literature as well as Western philosophy. http://infomotions.com/alex/

Mobipocket free Ebooks First download MobipocketReader from my links then download free ebooks from here or you can buy books from their main site and read them through MobiPocketReader ... http://www.mobipocket.com/freebooks/default.aspx

BookyardsBookyards has a total of 16,078 books, 41,782 external web links, 4,197 news & blogs links, 384 videos, 32,963 Ebook links and access to hundreds of online libraries (800,000Ebooks) for your reading pleasure. http://www.bookyards.com/

There's also readbooksonline.net. No downloads, but you can read online. They had quite a large selection, if I remember correctly.