Mashup Google API and Craigslist to Clone housingmaps.com

We need an application similar to [login to view URL]; a mashup between Googlemaps API’s (or any other like Yahoo etc) with the scrapings of a real estate classified site like craigslist (or any like Oodle, Zillow etc). When the user inputs criteria for a real estate listing with respect to a location it searches for it in the DB and returns results like housingmaps.com. We have some code for similar applications and other help. However the developer must deliver complete working system. Experienced with API and web site scarping etc only will be accepted; must show an example of similar previous work undertaken.