P.S. while I'm here, can anyone else here explain what kind of action the forum staff should take on serial harassers like these? Do they ban people for polluting the forum too much? I think theymos banned Matthew N. Wright when he started trolling like this too (this was after he scammed), didn't he?
You can try reporting off topic posts. Other than that "Ignore" is the best option. cryptohunter figured that one out and is trying to get around it by creating new accounts, which gets him a few replies but he gets outed (or outs himself) fairly quickly nowadays.