With interest-only loans, homeowners pay just the interest for a fixed number of months, usually 60, before they have to start paying off the mortgage at fully amortizing rates. There was an explosion of these mortgages issued in 2005, so many will reset in 2010.

Option ARMs are loans in which borrowers are permitted to make minimum payments every month, payments that are less than their monthly interest charges. Many borrowers use that option for as long as they can, but once the mortgage balance reaches between 110% and 125% of the original loan balance, the loans reset into a fully amortizing mortgage -- and payments rise steeply since the balances themselves have also gone up.

Real estate analysts predict a spike in these resetting loans, which might force another wave of homeowners into foreclosure.

The fear is that all these foreclosed homes will flood the market and drive down prices even more for existing homes, making it harder for new-home builders to compete. Les Christie