books themselves have forums which are moderated by authors and their teams

I have rarely found that to be the case with books I want to discuss with others. When it exists though, this would be a good solution.

What are your expectations from it?

Today I just want to ask a few questions about An Elegant Puzzle. That could use a common forum website setup. I suppose it could get fancier but I think a forum organized by topic, subtopic, then book would suffice?