Okay - we have discused this issue before, but to recap:
I (and many others) would like to know when a thread we have posted on is posted on again, by someone else. That way, we can "follow our conversations".
Now, for the new idea bit!
Maybe, we can add a column to the thread list, that shows you have EVER posted on that thread, or the last date/time you did. That may be WAY less development for Russ, and still provide some part of this much needed feature.