www.zillow.com allows you to search for real estate homes that are on sale. Like most other real estate websites such as Trulia and Redfin, you can check out the price of the home for sales, the estimate monthly payment, the number of beds and baths, the square footage, lot size if applicable and the number of days it is on the site.
However, what is more useful at www.zillow.com that is different from other websites is that it provides a Zestimate which is the estimated value of your home. Zestimate is Zillow's proprietary algorithm which takes a number of data to compute an esimtated value for the home. This estimated value is also an estimate and by no means a substitute for the actual appraisal of the home and the real marketing conditions. Sometimes, I find that the Zestimate is quite far from what the current homes are selling for and this is more so whenthe market is extremely volatile during the housing financial crisis.
Zillow.com is a great site nevertheless to search for home as it also shows you a bird eyes view and a map view of the homes with the lot all carved out appropriately and also the Zestimate home values which give you a really good bird eye view of the home value in the area.