If you've already downloaded "Google Earth", check out "Mesa, AZ GM Desert Proving Grounds". It's huge and a real goof to see from space. If you haven't downloaded "Google Earth" well uhm.. "Google" it (it's too cool).
I think that some of those satellite pictures are a couple of years old. I was playing with that Google Earth a little while ago and found that and my relatives houses down there along with Williams Gateway Airport with a few military copters out there. I also found my house when I was living in Southern Oregon with my parts Mustang out front.
Good tool to waste time at work.