I stole this word for word from another blog. Here is what he had to say about Zillow:
"This could take water cooler talk about home values to a whole new level. Check out Zillow.com, the latest start-up venture from Richard Barton, one of the founders of Expedia.
Submit your address, and up pops a satellite/street map showing the estimated value of your home, along with the values of every other home on your block. By viewing the house detail, you can see the sales history of the home, and the taxes.
I checked our address, and they had our 2005 taxes correct down to the dollar. Wait a second - why am I paying $300 more in taxes than either of my next door neighbors?! This site is going to be trouble.
I checked a few addresses. Most seemed about right on value, but others seemed way too low.
Here's a story about the company shaking up the Manhattan real estate scene."