in reply to Text Analysis Tools to compare Slinker and Stinker?
Well, you could (depending on the aptitude of this person) set a unique ID cookie and cross-check it with the ISP (netblock or static IP) and the User-Agent to track the fellow, but that doesn't help you right now.
Sure, you could follow mojotoad's lead and compare the text of his posts. That would make for an interesting follow-up on how you implemented the software.
I hate to give a non-Perlish answer, but did forgiveness ever cross your mind? I think if this "Slinker" slinked his or her way back to your forum, perhaps they're deserving of another chance. Even on Perl Monks, there's reincarnation.
Of course, if they do it again, give 'em hell.
John J Reiser