Somebody write a vbulletin mod that will allow an extra column for "thumbs up/thumbs down"
Not that dumb karma thing that was around a couple of years ago. Don't make the post rise to the top, just give it credit - another column that people can see that will allow them to see which threads are worth visiting and which ones suck.
+thumbs up
-Thumbs down
You will always have trolls, but at the end the cream will always rise to the top.
