Google added two new features to Google Earth. Now you can click on the balloon in the 3D model to learn more about a place and dig deeper by following the links in the balloon.
You can use
Google SketchUp to create, modify and share your own 3D models, or create 3D models of buildings. You can select a city, make a building with photos Google provides, save the building -- and it will
be reviewed and added to Google Earth.
Read the whole story at Google Lat Long Blog »