Here's the thing we all need to keep in mind...
This particular individuals goal is to cause mayhem on the boards, and to get attention - negative attention in this case.
The best thing to do is ignore him and do not engage him in any threads. Even this thread just fuels the fire.
How can everyone help?
PM one of the mods with a link to a thread he has posted in if you find it has not been taken care of within 12 hours or so. You don't have to PM all of us, and I'd recommend PMing a mod that is recently active. Not all the mods are active on the boards right now. I know that Bang_guy, myself, and Beth have been working on this situation actively, and I think sep has been floating around but I'm not sure.
Do not respond in a thread that he starts. If his posts are the only ones in a thread, the thread goes away when we purge his posts automatically. If you've responded, your response remains in the thread causing more work because we have to go in and find these individual threads and remove them manually.