Here it is!
Google Earth kmz files
Here is a resource that may be useful for Google Earth, or at least as an example of how students could share geospatial ideas
There is a story here! Until last week, KMZ files (the file format that is used by Google Earth) were not able to be uploaded to Edublogs, as they came up as a dangerous file type. After a few queries, and a bit of investigation, the good people at Edublogs verified that the KMZ is an OK file type , and they can now be uploaded. And the actual changes took less than 12 hours. Overnight in fact.
This is a quite incredible response for a service that is free to individual teachers. I can’t think of many “commercial” providers that can come close to that degree of responsiveness. These people deserve congratulations.