When Google announced the Nexus One last month, it also showed off Google Earth for Android for the first time. And now, it's finally available. Looks like it's an Android 2.1 app (it doesn't show up in the Market on my 2.0.1 Droid), and pinch-to-zoom is fully enabled.
There are a number of layers available for Google Earth, including Places, Businesses, Panoramio, Wikipedia, Roads, Borders and Labels, and Terrain.
Google Earth is a hefty app, taking up about 22.5 megabytes of space of your phone's storage. You can download by scanning or clicking the QR code to the left.
Update: And now we have video of the Google Earth app after the break.