How funny Cyra. I just read an article about a place that I was going to post that emails a part of a book to you everyday and it is free. I will go search for the info and post it. The place you posted sounds a lot like this: http://bookcrossing.com/
I have been a member there for a LONG time and love it. Instead of setting books free you can trade with others what is on their "book shelf"