This is the first round for the book club, so we're kind doing it by feel for now.
The basic idea is that there is that there will be a dedicated forum for each book, for example, February 2010: Quantum Psychology, and in this forum book club members can post their questions and responses to the text in self-created topics. Readers can choose which threads to participate in, or start their own. This allows everyone to read at their own pace, while still engaging.
With non-fiction there's less risk of "spoilers", and with exercise-based books such as Quantum Psychology, it makes for straightforward discussion, as well as whatever else strikes your fancy.
Though, as I said, this is our first book, so suggestions on how to work this are always welcome. :)