If you are just getting started with Google Earth, or are looking to help teach someone the basics, there are some short video tutorials developed by Googler John Gardiner (who is a documentation specialist on the GE team). John writes the Using Google Earth blog which periodically publishes posts on features of GE. So far he has published 5 short video tutorials on the basics of using GE.
The first video helps teach you the basics of “Navigating in Google Earth“:
Here is the list of currently available short video tutorials:
For more a more comprehensive collection of tips on GE, Google Earth Blog has a list of information and tips available in the GE Basics section.