How to use Google Earth

Sean O'Connor at the IMINT & Analysis blog has a post detailing how he uses Google Earth to search for the interesting things he posts about (aircraft, SAM sites, submarines, etc.). Google Earth is great - I recently used it while writing a military counterfactual in lieu of aerial reconnaissance to map out landing zones for an Allied amphibious invasion of Yugoslavia in WW2. Now I plan on using it to do a bit of research on the Tuareg situation.