Call the FBI. That's what we pay them to do. Tell them that death threats were made against you in a public forum.
Surprisingly, they are very efficient at tracing people, especially if it's related to terrorism.
Now, if you feel your life is threatened, I would personally "get out of dodge", figuratively, or not.
===== Christopher Mahan chris_mahan@yahoo.com 818.943.1850 cell http://www.christophermahan.com/
Sound advice. This -is- illegal behavior, and the FBI would be interested. Last I knew, we knew EoT's IP. With that, there's really no 'tracing' necessary: it's basically one phone call for them. I'd direct them to a page (preferably one the address of which can be said over the phone without too much trouble...) where all his threats against people are listed... most especially those that involve militant Islamic groups, as that'll especially get their attention.
--Jake