Exactly. After knowledge crystallizes as a result of Q&A in a forum topic, it would be great to publish on the QS wiki a comprehensive summary of the discussion. I think one of the candidate topics already would be State of the art for quantified weight loss.
As for organizing forums, I think we're a bit in the area of having too many, some of which haven't yet been used, or have seen very light use (Data Ownership, for instance). Posting in the QS Open Forum would be a good way to see what groups of topics emerge.
The forum software also supports sub-forums. Data Ownership could be a sub-forum of Apps & Tools.
I initially created the forums by mirroring the most populated tags at the Quantified Self Guide: apps (totaling "Android", "iPhone" and "Web apps") was #1. It was followed by Heath, then Fitness etc. We somehow lost Health in the initial process, but it might be a good idea to have it as a catch-all if a topic doesn't fit better in another forum. This would solve, I think, Dave's inquiry about environmental monitoring. On the other hand, "Health" may be about as general as "QS Open Forum", so as Gary says, let's wait and see.