It's an easy enough download and it's there for the taking! Go to http://www.droid-life.com/2010/02/google-earth-for-201-and-non-rooted.html for instructions. You may need to use the alternate download link because the primary's bandwidth is already exceeded. Now you can surf around Earth the Google way, all on your Motorola Droid!
I believe to get it from the market you have to have your phone rooted as the build.prop has to read as an Android 2.1 device. Live wallpapers are the same.