BTW, the PM spam is being discussed on vBulletin related forums too, so Stephan or other admins may be interested in looking at it, and implementing some measures for limiting the spam:
[ame=http://www.vbulletin.org/forum/showthread.php?t=168305]Private Message spam - vBulletin.org Forum[/ame]
Spammer using PM system to spam - vBulletin Setup
[ame=http://www.vbulletin.com/forum/showthread.php?t=169616]Respond to PM Abuse Complaint: Delete all spam PM's from known spammer? - vBulletin Community Forum[/ame]
vBulletin needs to tackle Private Message Spam iTamers Simple SEO
[ame=http://www.theadminzone.com/forums/showthread.php?t=28464]Tips on fighting spam in vbulletin - Admin Zone Forums[/ame]
Tips on Stopping vBulletin Spam - vBulletin Setup
[ame=http://www.vbulletin.org/forum/showthread.php?t=168305]Private Message spam - vBulletin.org Forum[/ame]
Spammer using PM system to spam - vBulletin Setup
[ame=http://www.vbulletin.com/forum/showthread.php?t=169616]Respond to PM Abuse Complaint: Delete all spam PM's from known spammer? - vBulletin Community Forum[/ame]
vBulletin needs to tackle Private Message Spam iTamers Simple SEO
[ame=http://www.theadminzone.com/forums/showthread.php?t=28464]Tips on fighting spam in vbulletin - Admin Zone Forums[/ame]
Tips on Stopping vBulletin Spam - vBulletin Setup