Booksfree.com is like Netflix for books. You pay a monthly fee to have a certain number of books out at a time and you mail them back in a postage paid mailer when you’re done. They only have paperbacks though, and most of the books I want and can’t get at the library are the new hardbacks that are immediately reserved and out for months. And for the lowest monthly fee ($6.99 for 2 books out at a time), I could buy 3-4 used paperbacks a month. I really enjoy browsing at the public library and used bookstores, so this concept, though I like it, doesn’t fulfill a need for me. (Washington Post article) (and don’t forget about booklend.net)