Well MtGox clearly has a problem with USD withdrawals, which is why this arbitrage opportunity exists in the first place and doesn't seem to be closing. If the

Well MtGox clearly has a problem with USD withdrawals, which is why this arbitrage opportunity exists in the first place and doesn't seem to be closing. If they fix the USD withdrawal problem, which I suspect they will do as they start to lose business to the other, better exchanges, expect arbitrage to obliterate the price difference between MtGox and other exchanges.