The mobile version of Google Earth is now available for the Android mobile phone platform. It’s available for the Nexus One and most devices with Android 2.1. (Which, Gizmodo says, “effectively limits it to the Nexus One. The good news is that the Droid, and some older HTC handsets, are due for a 2.1 upgrade relatively soon.”)
Update, Feb. 23: Google Earth Blog has a hands-on review.