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"As home prices appreciated from ridiculously high to unbelievably higher, more Americans began using mortgages that allowed them to buy more house for less of a monthly payment. Next year, a large portion of those rates move up and homeowners who opted for the exotic mortgages could find their payments doubled. Talk about bloody. They need to find a way to minimize the pain.

Many will refinance their loans. But for others, whose mortgages now exceed the value of their homes or whose debt payments exceed 40 percent of their incomes, there may be no other solution than to get out of their houses. With the housing market cooling, selling it may not be easy. Some may default on their loans.

With more homes on the market, prices could begin to fall. That reduces home equity — the difference between the amount borrowed and the total value of the home — and could force people whose loans change in 2008 and 2009 to consider selling, further accelerating the drop in prices. Some of those cities with the highest proportions of interest-only loans are also at the greatest risk of falling prices." (emphasis added).

Here's what the data looks like:

"In 2003, of all new mortgages, 10.2 percent were interest-only, meaning the homeowner paid only the interest for the initial period of the loan. According to Loan Performance, a research firm, 26.7 percent of all loans were interest-only last year and another 15.3 percent were payment-option adjustable rate mortgages, which allow homeowners to choose how much they paid each month."

The problem is more concentrated in some regions: "In most California cities, as well as in Denver, Washington, Phoenix and Seattle, interest-only loans represented 40 percent or more of all mortgages issued in 2005."

Here's how this plays out:

"Traditionally, interest-only loans and adjustable-rate loans were used by people who expected to live in a house only a short time, but such loans have turned into “affordability products” as housing prices rose. The interest rate on the loans, while below that of conventional 30-year fixed-rate mortgages at the beginning, resets after 3, 5, 7 or 10 years, depending on the loan. So, homeowners who took out loans in 2004 could find, for example, that their initial 4.25 percent loan climbs to 6.25 percent or 7.25 percent next year.

Someone now paying $350 a month for a $100,000 interest-only loan could be facing payments of $680 both because of the shift to the higher rate and because the borrower would have to start paying off the principal as well as the interest."

Bad if you have an interest only loan.. Good if you're in the business of re-selling foreclosures.