Housing Maps

HousingMaps is an amazing service. Basically it combines the housing listings in Craigslist with map information. You can see the location of each offered house/apartment. Thru Google maps you can also see the aerial photograph of the area. Services like this are going to be big as long as they don't piss off the sites they are polling their data from. I guess, as long as sites like Craigslist provide RSS data, it cannot easily be stopped.