Frank Taylor, author of the Google Earth Blog, recently presented at the Where 2.0 conference. His presentation focused on "what is possible with Google Earth." I couldn't find the slideshow has not been posted on any presentation sharing sites so you'll have to download the file to view the slides. The presentation, titled "Extending Google Earth" offers some good examples of Google Earth mash-ups and other uses of Google Earth that you might not have considered before. Taylor focuses on Google Earth as a visualization platform and not just a mapping platform.
Thanks to Rich Treves for posting the link to the slideshow on his blog Google Earth Design.
Applications for Education
If you're looking for some new ideas for using Google Earth, this presentation may be for you. You may also want to look through the entire list of presentations at Where 2.0 for other ideas about using Google Earth.
Here are some related resources that may be of interest to you:
KML Factbook - 2D and 3D Mapped Data Displays
Award Winning Google Earth Lesson Plans
Google Earth Links You Might Have Missed