well Google Earth in the begining ONLY worked on iPhone 3gs, NEXUS ONE, and the orginal Moto Droid..
Google Earth for mobile the 3 devices are still pictured even.. i know theyve expanded since though
are you sure Goggle Earth will run on an intercept?? your gonna have to goto a store and play with one and see if its in the Market... or atleast load m.google.com/earth and just make sure before you order the phone.. they may not be as selctive as they used to be, i just know in the begining Google Earth was very limited