Put your city on the 3D map
Engage the public by featuring your city's buildings, landmarks and
terrain on Google Earth.
If your local government is like many around the world, you've
invested in developing a 3D model representing buildings in your
city's downtown--perhaps your entire jurisdiction. Or, maybe you
haven't yet produced a 3D model, but you've collected the geospatial
data necessary for producing a model. With Google's Cities in 3D
Program, your local government, community group, or educational
institution can share this 3D data with the public by adding a model
of your city or community to Google Earth.
continue...
http://sketchup.google.com/3dwh/citiesin3d/index.html