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Re:Ask HN: Book trading service by mikecane on Tuesday August 17, 2010 @02:04PM (#1611918)
I haven't tried this: bookmooch.com
Re:Ask HN: Book trading service by johnbuckman on Wednesday August 18, 2010 @11:35AM (#1614437)
It's my site, would be interested in any HN comments.

-john