All the year+ old thread dredges that have been going on lately reminded me of a feature that a web development forum I'm a member of has. The forum, like this one, is vBulletin based, and if you try to dredge a thread that hasn't been active in x days/weeks/etc, it tells you:
"You are about to reply to a thread that hasn't been active in x days/weeks/years. Consider starting a new thread rather than dredging up this old one"
Not that there's anything wrong with dredging, but most of the time people aren't aware they're bringing a thread back from the dead, especially if they found it via search.
Oh, and we still need thumbs up/down smileys.