Search FSBO real estate listings via Google Maps and Google Earth. Nice, fast interface with photos of properties, mortgage calculator and it shows date the property was listed for sale.
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Google APIlity Library
Google Maps API Documentation
Tutorial for a IP to geolocation aggregator script
Density Map Tutorial
Intro to Google Maps API for Flex
How to add a Google Map to any web page in less than 10 minutes
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Executive Editor, ProgrammableWeb. Author, Map Scripting 101. Lover, APIs.