The current vB is 3.0.6. As an owner of a vB myself, I would totally suggest, if you can, to update to 3.6. It's a pretty nice upgrade, for one, and also, I found a hack for this site that you guys would love.
http://www.vbulletin.org/forum/showthread.php?t=123254
:headphone
http://www.vbulletin.org/forum/showthread.php?t=123254
:headphone