Google Earth Educational site with lessons
Hopefully you find the time to swing by the new teaching with Google Earth website www.gelessons.com The site is by and for teachers with complete lessons, including video tutorials, with more on the way (I am putting the finishing touches on a lesson now where the students use Google Earth to create overlays and then do Mean, Median and Mode exercises related to the data they collect).
The site is pretty interactive and I hope to add a lot more functionality as time goes by! For example, my son wrote a tiny Java Applet that generates random coordinates which can then be used to test student's proficiency with Longitude and Latitude (it needs a lot of work, but it does work :-)
Anyway, hope you can swing on by!