I looked back before posting this to see if I could find updated info. The last post I found was 2 years old. So if this is a repeat accept my apologies in advance. Below is the info from the webpage on the free service:(I inserted it as an inline frame to avoid copying it. You are acutally looking at the page itself.) Here is the direct link: Go to the website Pay specific attention to the last paragraph "About the Technology" for those concerned about number of hits per day.
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In the coming weeks we will be posting examples to show you how great it is to be able to see your properties on location, in Google Earth. Stay Tuned!