Who matters now?

Curious to know how much your home -- and your neighbor's -- is worth? You can find out fast, thanks to Barton and his Zillow.com. Attracting over 5 million visitors a month, Zillow allows users to see estimated values of homes across the United States - although many agents argue that Zillow's figures are often off, making their jobs more difficult. But with home prices in constant flux, no homeowner can afford to ignore the power of Zillow.

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Tell us who you think matters now -- and why