The NOAA (National Oceanic and Atmospheric Administration) has been mentioned on Google Earth Blog quite a few times. They make excellent use of Google Earth as a way to visualize the vast amounts of data that they process.

They've recently released a collection of nearly 8,000 shoreline surveys that have been collected over the past 171 years. Using Google Earth, you can preview and overlay any of the surveys in a very intuitive manner.
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