Is this just a ripoff of PadMapper ( http://www.padmapper.com )?
Isn't PadMapper just a ripoff of http://www.housingmaps.com/ , which was the first of its kind? I developed http://www.cribq.com because at the time, both PadMapper (if it existed, can't remember - according to domain records padmapper.com was registered after CribQ launched) and HousingMaps were too simplistic and behind on listings to use. HousingMaps had no organizational tools - so I suppose PadMapper "ripped" th…
For an example, see how different the results of our both tackling the same problems were - they barely resemble each other in form or functionality.
But yeah, the basic idea of showing real estate on a map is old, I have a research papers from the 80s that talks about making map-based search systems for real estate. housingmaps is the earliest web-based implementation of the idea that I know of, though, and was my inspiration.