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Have you checked out the Games Forum? That is were a lot of Wish List book swaps take place (and the only place PBS lets them happen). Check it out. You may also find some buddies in your genre. Often times buddies will post directly to each others WL. Outside of the Games, the only book-to-book swap that can happen is in the Box of Books and since books need to be on your shelf for that, Wish List books don't get traded there.