I believe that goggle earth would be a very interesting thing to use to supplement a lesson in history. I think it would be very interesting to map out events like the civil war and the word wars. It would be very useful to map out key battles and were treaties were signed and other events that shape these monumental events.
Another way to use this is having my students doing a similar project to what we did. This program is defiantly a high school level material but it is manageable and usable with only a little instruction. Overall this is a very useful program and im sure it will not be the last time I use this program.