BookCrossing.com offers a way to recycle/share books. By registering your book through the BookCrossing website you can track the "adventures" your book takes. Leave your book on a park bench, coffee shop, hotel, or anywhere someone might find it. Then log on to track it as it globally passes from person to person. Each book has a unique ID number so future readers can log on and see where the book has been. You can even leave comments about what you thought of the book.
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Lately I've been contemplating ways to purge my bookshelf and this seems like a great way to pass on good reads in an eco friendly manner.