By now, there are only a few cities available:Atlanta, Baltimore, Boston, Dallas, Denver, Detroit, Fort Worth, Houston, Las Vegas, Los Angeles, Philadelphia, Phoenix, San Francisco, San Jose, Seattle,...
Thanks to Virtual Earth 3D you will be able to view the most important buildings of those cities as well as the most important places.
It is really well designed and the models are real, so you will not have any problem when finding a certain building or place.
Nowadays there are only some cities available but all cities around the world are expected to be included.
Now it also runs under Mozilla Firefox