I just received a book in the mail that I ordered from BookMooch, which is a book swapping site (not just paperbacks, but books of all kinds including audio books). The concept is that you have to post at least 10 titles that you are willing to part with. Every time you give a book away you earn a point. A point qualifies you to request a book from another member. There is no cost to join; your only cost is to mail your books to a requesting member. A similar site is Paperback Swap. Great fun!
~Ann
Read it or Weep 