Yes, this is very cool! A good example of putting GIS information into the hands of the public in a powerful way thanks to Google Earth and your innovative use of KML.

I've just written a little article about this at the Google Earth Blog entitled: City of Portland GIS.
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Frank Taylor - Author of Google Earth Blog
All about Google Earth news, features, tips, technologies, and applications. Also read: http://TahinaExpedition.com
(If you have story ideas, please send me a private message.)