I've discovered this neat on-line book club... DearReader.com. Well, it's new to me, but has been around for quite a while. They'll e-mail you the first few chapters of a newly published book, and then you can sign on to their message boards to discuss with like-minded people.
They've got a number of different genres featured, mystery, romance, non-fiction, business titles, science-fiction, classics, and more, as well as a separate book club for teens. Check it out!