Somebody hooked up a property database to google maps at
Zillow. Now house-hunting can be even more fun, because you can walk around looking at houses while carrying a laptop with wireless and find out how much someone's house is worth while borrowing their internet connection! I'm not sure how accurate their price estimates are, or how frequently they update their information. But it is a much better interface than the various assessment databases.
Note that we're not actually looking for a house to buy now, but it is fun to look around and we probably will be some day.