Google Sightseeing Blog explores the world via satellite. Making posts every weekday viewing weird and wonderful things around the world using Google Maps or Google Earth.
One recent posting shows a unique Solar Project in the Mojave desert, California (The image bottom left is a photograph of the Solar Project. Bottom right is a Google image).
Some great lead-in stories with images to begin many class discussions.
Another website you need to check out is Flash Earth.
It is an experimental Flash 
application that uses satellite and aerial images from online mapping websites (you have 8 different mapping websites to choose from). What I really like about this web application is the speed and ease of use. You can zoom in and out so quickly into any corner of the earth.
Use a cropper tool and voila.....you have some great images to use in your classroom.
