Redfin

The beauty of this website is its detail

Found it online through a forum. Its UI is just like Google map. Very intuitive. You can see many house icons on map view. When you click on a house icon, you can see related house info on right hand side. The house info shows you the last transaction info (e.g., how much the current owner paid for this house). I like this detail. It let me have an idea about this house's appreciation. I like to click houses on one area to see if all houses have similar appreciation rate. As mentioned in other posts, I once was thinking to buy a house. Since I relied on this site to get info much, I once was thinking to use Redfin agent. A bit disappointed.... So, I think Redfin is more for information. Not for the real home buying process.

http://www.redfin.com/