Here’s a handy app that enables users to create 3D buildings for inclusion with Google Earth – Building maker.
Details… Building Maker is a 3D modeling tool for adding buildings to Google Earth. It’s fun to use, and an easy way to get on the 3D map. What a great way to build out your city in 3D! Try it at http://sketchup.google.com/3dwh/buildingmaker.html