BookSneeze is a website (free to join!) that cooperates with bloggers and provides literature (mostly of Christian nature) for those bloggers to read and review.
As soon as you sign up and you are approved, you can request one of the currently available books. BookSneeze will send you these books (free!) for you to read, or provide you with a link to download an eBook version (which is highly popular on the site now). After reading, all you have to do is write a review of 200 words or less on your blog as well as a consumer website (such as Amazon). After you've finished reading and submitting the review, request another book and keep on going!
So what happens with the book once you're done with it? You keep it! It's free for you to put away on your bookshelf (or virtual bookshelf!), give to family or friends, or give away on your blog! It's yours!