You know, when I saw the ad for the G4 ibook listed at about $700 my first thought was that this was a scam. I even considered posting on the ad something to the effect of "be careful about this one", but that would have been against forum rules, and would have been unfair if the person had been legit. I feel sorry for you but you have to have a sense that the deal was too good to be true, and that maybe you shouldn't send this guy money.
I'd rather lay a beating on this guy! If I lived near him he'd already be paying with flat tires, anonymous phone calls at all hours, etc. Just make this guys life a pain in the ass. BTW, if you happen to be awake anytime between the hrs of 2:00 am and 5:00 am, I urge you to give this f_ck_r a call! I find times like this are good opportunities to test you faxing and redial software on your mac.