It's for 2.1. NOT for 2.0.1.
"The official Google Earth application has arrived in the Android Market this morning. We haven't seen any news from the Google Mobile blog yet, so we're trying to dig through a few things. As of right now, we know it doesn't show up for Android 1.5 or 1.6 but Nexus One owners have confirmed it to be available. A few of our twitter followers have indicated that it's not showing up for them either. So it appears that it does require Android 2.1 which makes sense to us. We just saw our first glimpse of it when the Nexus One was unveiled."