I also use StangNet sometimes, and on their boards there is a way to view ONLY the threads I've started or replied to. That way, amongst all the threads on the site I can keep up with the ones that I've participated in.
Is there a way to do that on these forums?? ( I realize this might be a dumb question, but I just don't see it.)
Go into a topic, in very small text at the top you'll see "Subscribe to this topic". Click that. On the main forum menu you can click "User Menu." On the left you'll then see a link to view subscribed forums and another for subscribed topics. You can unsubscribe a topic there.