dan08,
If you can prove what you said in the other thread, then you should at least try to get your money back by using legal means. Get some legal advice. If he has threatened you, then the Police need to know. You are NOT on your own.
Hmm, reading between the lines of your last message, are you saying you also received threatening emails from OTHER people after you posted here ? If so, then you REALLY do need to talk to law enforcement.