Not to hijack this thread's idea, as I think it's a great one, but one other organizational thing that would go along with this is a way to filter out old threads that keep get bumped for whatever reason, but are mostly old news. To do this, if we could sort threads by the date of the first post instead of the last posting date, it would be very helpful. What would be even better, though, would be to still sort threads by last posting date, but to filter out threads with first posts older than a certain threshold. To put this into context, I don't need to see a thread entitled "RALLY!1!" when it was started months ago and has largely become divorced from the current market state.
...or at least something that makes older posts really stand out as 'old' so that you don't accidentally reply to it, thinking it was just posted.
like, the posts currently alternate background colour of white/lavendar... what if any posts older than say 30 days were coloured brown... so you can easily see at a glance where an old thread was bumped.