For a Software Engineering course at Baylor, I made a website that helps people find a neighborhood to live in. Users enter a location in which to search along with some information about their desires, and the site pulls up a heatmap of recommended neighborhoods.
To generate the heatmap, the system integrates data from the US Census Bureau, the FCC, Google Maps, Education.com, and Walkscore.
The source code exists here (though I will admit it's not beautiful).