RuiCarmo of Tao of Mac has a great tutorial on hacking Google Earth KML (Keyhole Markup Language) files in PHP. Fun stuff. Seen here.

Google Earth / Keyhole is a downloadable mapping application that’s free for the downloading. Google Earth Plus is a $20 upgraded version that includes GPS integration, high-res printing, email support, annotation, and .csv importing.

Background – Google Earth in action

Google Earth

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Google Earth – Downtown Austin, TX

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Google Earth – IBM Austin