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.
"Use Google Earth to explore the world from the palm of your hand. Fly around the planet with the swipe of a finger, as you view the same 3D imagery available in the desktop version. Search by voice for cities, places, and businesses. Browse layers of geographic information including roads, borders, places, photos and more”
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.