There's a new site I just found-
http://www.readitswapit.com
It's a British site, and there are about 50,000 books on it. You list yours, and people search for the book they want & offer you their book list to choose one to swap. You only have to pay postage.
My 'To Be Read' pile is already huge
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'Do not crush the flowers of wisdom with the hobnail boots of cynicism' - Bill Bailey