On some of the wider-ranging boards, it would be nice if there were a gentle way to remind people to put the town or area they're asking about in the title.
I think formal keywords/tags would be too rigid and a barrier, but what if above or below the title field on the "new thread" form there was a reminder -- custom per board -- reminding the user to mention the area?
E.g. for Florida, somewhere right by the title field it might say "Florida is a big state! Be sure to mention the city or metro area (Miami, Tampa, etc.) in your title!"