Zillow.com: The ranks of the "upside down" grow

Sorry I've been offline for a few days. Had a lot of things to take care of and some time off. Now, back to business. Zillow.com is out with the firm's latest report on "upside down" homeowners -- those who owe more than their homes are worth. The real estate data company estimates that 21.8% of U.S. homeowners are now underwater on their mortgages, up from 17.6% in the fourth quarter of 2008. Zillow's data covers 161 metropolitan areas. More data is available here.