Need to find real estate comps?
www.redfin.com is a sweet site. Not only can you search for new homes on the MLS listings but you can also search previous Sale Records. I don't know of any other site that offers the same functionality. Click the 'More Options' link by the 'Search Listings' button.
Another really nice feature, If you find a bunch of homes for sale in a viewable area on the map, click the 'DOWNLOAD' link to get all of the info in excel (csv).