I vote we separate out the want/sale/trade part of the "Billboard" from the "interesting websites & introductions". THEN, we either:
A) Let each person keep there own Subject. That would make it pretty easy to tell who's active, and keeping up on their lists. I'd also suggest that folks be required to state their edits, rather than just 'bumping'. Just because it makes things more interesting
Alternatively, if you don't like bumping at all, we could still have an update thread stickied, which would then become MUCH easier to use, since we wouldn't have to say "go to page six, then scroll waaaay down towards the bottom" (or learn to use proper html location links).
B) Do w/s/t by either months or quarters. Again, this would make it easy to tell who's active, and keeping up on their lists. Though this would take up more space than option A, if that's an issue. For this one, people would just need to copy/paste to a new month/quarter if they have no changes.
EXAMPLE: "Member Want Lists -- May 2010"
EXAMPLE: "Member Sale Lists -- Second Quarter -- April thru June"
It seems to me either option would keep things from getting too awful cluttering, since all the threads would be penned up in their very own forum.