Great idea, but I don't want to buy a book I don't like. And I think the immediacy of the inquiries is important for the activation. So an PR book club should meet using something like ICQ. I would prefer a system with voice capabilities. My past experience with voice and net is that it's little on the low quality side. However, that was a while ago.
Other issues are who gets to picks the books, who going to fully activate (or old read). Book availability, I don't mind buying books but for a book club activity I'm less motivated. I personally wouldn't be able to participate for a few weeks, but it will probably take that long to get organized.
Oh oh oh. Mister Kotter! Free books online. The Gutenberg Project, classic books online. Maybe some else know of another source.
No picking books well all know about. No Mobi Dick and books like it.
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A first step, would be to create a list of candidate books. The identify books interested to read, books you have read, books you'd volunteer to act as the expert on.