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BookMooch.com: "This is a community for exchanging used books. BookMooch lets you give away books you no longer need in exchange for books you really want. Every time you give someone a book, you earn a point and can get any book you want from anyone else at BookMooch. Once you've read a book, you can keep it forever or put it back into BookMooch for someone else, as you wish. There is no cost to join or use this web site: your only cost is mailing your books to others".
PaperBackSwap: "Mail a book. Get a book. Any book you request is yours to keep, share or trade. No late fees. No processing charges. No hidden charges. Every time you mail a book to another member, you can request one for yourself from over 3 Million."
PageByPage: "Page by Page books is committed to bringing you a wide selection of the best public domain books available, all in an easy to read format. Most sites with online books have the whole book on one page, forcing you to wait while the whole thing downloads. Even worse, if you don't read the whole book in one sitting, how do you keep track of where you are? Do you really want to have to look through thousands of lines to find where you left off? Some sites are better in that they put one chapter per page. Even this is hard. What if you get interrupted in the middle of the chapter? How do you bookmark it? To fill this void, PageByPageBooks.com was created. Read a little or alot, sneak in a few pages over lunch then read some more after dinner, no matter how much you read at a time, you can bookmark it and come back to exactly the right place."