The bad news is that there are even worse bets out there. There are credit default swaps written on subprime mortgage securities. It's bad enough that these subprime mortgage pools that banks, investment banks, insurance companies, hedge funds and others bought were over-rated and ended up falling precipitously in value as foreclosures mounted on the underlying mortgages in the pools.
What's even worse, however, is that speculators sold and bought trillions of dollars of insurance that these pools would, or wouldn't, default! The sellers of this insurance (AIG is one example) are getting killed as defaults continue to rise with no end in sight.