] The 2004 meters high Mega-City-Pyramid TRY 2004, is a
] partial answer to two important problems : with cities
] becoming more and more crowded and the environment
] suffering progressive damage, the time has come for the
] development of a megacity that functions in harmony with
] nature. So, the city proposed by the Shimizu Corp.'s
] engineers represents the ideal form of living for man in
] harmony with the earth

Saw something about this on the Discovery channel last night. This isn't a great link but gives the basic idea.

This is a fairly extreme example, but Atlanta has really taken to "new urbanism." The idea is that in typical suburban "zoning" you work, live, shop, and go to school in different places, and the result is that you interact with different people in each place. Therefore you tend not to care about them. By doing all of these things in the same place you form stronger bonds with the other people in your community.