The dsSearchAgent is a real estate product built on Google Maps that any agent or broker can place on their website.
This real estate search engine is very powerful and allows users to define a huge number of factors. As well as the normal real estate search options of location, price and numbers of bedrooms / bathrooms, the dsSearchAgent lets the user define the lot size, days listed, year of build and a lot more.
The Spanish Property Directory
Property Net Spain is a search engine that can help you hunt down property for sale or rent in Spain.
From the front page you can type a partial or full town name in the search box - typing "marb" for example should give you a couple of results, including Marbella. Once you select your desired location you are taken to the property listings, which includes a Google Map view.
You can do the usual filtering tricks by setting multiple property types, price range, min/max bedrooms and bathrooms etc. One cool feature is that if you can't find what you want, instead of starting a new search, you can simply drag the map around and the property list updates as you move the map.
Movoto Real Estate
Movoto is a US real estate search facility. The site uses Google Maps to display the location of properties and to help display neighborhood information.
The property view allows the house hunter to define location, price range and number of baths / bedrooms. Movoto also has comprehensive neighbourhood information which lets you view a whole range of demographic, crime and property statistics about an area before you buy.