Zillow.com is one of the most popular real estate sites on the Web, but it's not well-liked at the Phoenix headquarters of the Arizona Board of Appraisal. The board is ordering it not to provide "Zestimates" on the value of homes in 'Zona on the grounds that it isn't a licensed appraiser in the state. If Arizona gets its way—and other states follow suit—it could be a big problem for Zillow, since those Zestimates are one of the site's big draws. According to Zillow, its "automated valuation model provides Zestimates on more than 50 million homes nationwide and is used tens of millions of times each month."

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