BookCrossing

http://www.bookcrossing.com/

http://www.bookcrossing.com/about

http://www.bookcrossing.com/faqs

http://flashmob.wiki.taoriver.net/moin.cgi/BookCrossing

Related:
 * WheresGeorge
 * GeoCaching
 * Flashmob
 * OutReachBooks

ISBN 3499237482