Google Earth is, at least for now, nothing more than a fancier and more useless Maps-application. It really feels more like a tech-demo to show off the graphics-capabilities of modern Android-phones than something you'd actually use.
With that said, the app is still kind of cool and it's nice to be able to fly around the globe and quickly zoom in on something of interest. It also has a few great layers (like wikipedia) that can help guide you to points of interest.
For more Android app recommendations visit my set: Android Applications.