OpenEarth is the open source initiative to archive, host and disseminate Data, Models and Tools for marine & coastal scientist and engineers. It aims to remedy the above-described inefficiencies by providing a project-superseding approach.
It seems like the usage of Google Earth goes way beyond checking for your neighbours garden and with the possibilities fo KML complex data visualizations in a 3D environment are at your fingertips. OpenEarth even provides some tutorials on how to get startet with these types of visualizations.
Do you have any other examples of data visualization in Google Earth? Or are most of the data mash-ups done with Google Maps?