This looks very interesting ...
Kindle Users form eBook Lending Club on Facebook
But will publishers go for it?
Here's how it works.
P. S. Just discovered another site, courtesy of @joycevalenza, http://ebookexchange.com "Lend an ebook, do some good. If a book borrower makes a contribution when they borrow your book, all profits during 2011 will go to charities fostering childhood literacy."