Check out the cool new features of CityEngine Pro, by Procedural. Procedural was recently acquired by Esri.
In front of an audience of more than 14'000 people, Gert van Maren, 3D product manager at Esri, showed in an impressive live demo some of the new capabilities of CityEngine 2011. He demonstrated the novel drag'n'drop features allowing easy-to-use GIS data import, comfortable placement of landmark models, and simplified rule assignment. Furthermore the brand-new Style Manager has been introduced which allows for a interactive preview and selection of different rule templates. This and more can be seen in the video below: