Even the slowest method of ground shipping would have reached you by now. Its a tough one, when do you decide that someone is a piece of sh*t? Over how long a time frame has he not answered your emails? ie, did you send him 3 yesterday that he hasn't answered yet or has he not ansered 3 emails sent over the course of a week? That part would worry me the most.
I would say that if you don't hear from this person soon, contact pay pal and tell them what happened. Maybe they will do something. You can also call your credit card company and let them know what happened. And, send a final "this is your last chance" email to the person letting him know you're next phone call is to the police.
And, if things turn out bad for you, don't forget to warn all of us here about the person!