Google Earth can be used for all kinds of lessons in math (see Real World Math), science (try these resources), and language arts (try Google Lit Trips) in addition to the obvious social studies applications. One of the best ways to use Google Earth in social studies and in language arts is to have your students create narrated tours of significant places. Those places might be the sites of significant events in history, the setting of a favorite book, or a favorite place close to home.
In the video below I demonstrate how to quickly create a Google Earth tour, how to save a Google Earth tour, and how to share a Google Earth tour.