Here are just a few sites and ideas to wet your appetite:
Track Weather, Hungriness and more: Visit from this site for more info: http://www.gearthblog.com/blog/archives/weather/
Take virtual field trips with Google Earth, by downloading KMZ files:
How to create a virtual field trip: http://www.bridge.edu.au/verve/_resources/GoogleEarthHowToVFT.pdf
Identify key elements of what human life on the Moon would be like bu taking a Lunar Field Trip: http://www.realworldmath.org/Real_World_Math/Lunar_Field_Trip.html
Useful Google Earth Layers
Hopefully this has sparked your interest and opened up some ideas and ways you can use this within your classroom. A simple Google search for "kmz field trip"or "download kmz files" will turn up more resources and get you on your way to adding this resource within your classroom lessons.