We have spent the morning giving the demo version of CityScape 1.6 from PixelActive a spin and we can honestly say we are impressed. CityScape is an urban modeling tool that allows users to build both custom and real-world environments quickly and easily. The focus of the modeler is on allowing developers to concentrate on design rather than the labor involved in creation.
Of note is its support for Max/Maya via COLLADA opening up the possibility for rapid city building - we hope to have more thoughts on CityScape on the blog later next week.
You can download the demo via PixelActive, the movie above gives a good overview.