After using GE this morning, there was continuous disk activity, and my flightsim was really slow to load textures.
Apparently there is a memory leak on the latest but one version of GE, which will eventually fill up the HDD and render the computer useless.
It writes to:
C:\Documents and Settings\*YourName*\Local Settings\Application Data\Google\GoogleEarth\unified_cache_leveldb_leveldb2
Mine had grown to 40 GB when I uninstalled GE and restarted the computer.
Apparently this is a know issue, and will be patched.
GE stays off my computer until I know for sure.
Remember to save the My Places kml file if you have one.