Warren Pollock points out that the real danger lies, not in Dubai possibly deciding to default on its sovereign debt, but in the credit default swaps surrounding the debt, which may magnify the problem by 10 - 100+ times. If some of these huge side bets are wild ones not adequately backed by the gamester's capital, off we go - and off Pollock goes, for his well-earned beer.
Incidentally, he gives a lovely description of a quantitative analyst: a schizophrenic with an IQ of 160 who belongs in a rubber room, but since he's working for a financial firm and "no-one understands him, what he's doing must be right". Only a brighter quant could spot his colleague's errors. Quis custodiet, eh?