I was watching "Call for Help" on TechTV yesterday and they mentioned this tool. I figured it might be useful for others in here at sitepoint. It's called NeoTrace but McAffee must have just bought it and now it's called VisualTrace. Here's the article about it...
I've been using it track down spammers ISPs, etc. It works great! I'm not associated with TechTV (wish I were) or NeoTrace just thought you all would find this useful.