Off topic discussions
Would it work to make The Back Porch forum available to members only? Not as a way of excluding people but so that anyone coming casually to the site in search of information on Cpn wouldn't be distracted by discussions about Shakespeare, football, the mysteries of the universe etc.
This isn't the easiest site to work your way around (unless you go straight to Ron's excellent How to Work This Website) and fogged-up newcomers would then have the chance to see just how good it is as a medical resource before deciding if it's worth registering and staying around. Then once a member ......look what treats are in store!