A job search engine and web mashup that incorporates Google Maps to see the location of an employer, LinkedIn to see which of your contacts works at the job location, and Payscale to see current salary analysis by job category.
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JobMapper in Ruby
Integrating Google Maps into Your Web Applications
How to add a Google Map to any web page in less than 10 minutes
Ruby Geocoding Library
Density Map Tutorial
Tutorial for a IP to geolocation aggregator script
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Executive Editor, ProgrammableWeb. Author, Map Scripting 101. Lover, APIs.