Google Maps has introduced real estate listings, with various search parameters as you can see in the example below.  Although the search parameters may not be as sophisticated as some of the websites specialising in such listings, they are adequate enough for most house hunters. You can enter a range of prices, number of bedrooms and bathrooms, as well as square footage area.  An indication of the sorry state of the economy is the first search parameter which is for foreclosures!

Google Maps Real Estate listings are gathered from a variety of online sources and make it easy to search for real estate without ghaving to sign up or pay.