Even if wireless cities in the developed world are a questionable prospect, wireless certainly has a role to play in other contexts, be they localized networks such as the wireless systems in place in many universities or in parts of the developing world. One system, mesh networking, in which information passes in a distributed fashion from node to node is really too slow for application in places with broadband available, but is a possible solution for areas in developing countries.
Given how much Tibet has been in the news lately, I thought it appropriate to cite the example of the Dharamsala Wireless Mesh network which was covered by Xeni Jardin in Wired a couple of years ago. In Dharamsala, a community of Tibetian exiles have set up a mesh network to provide Internet connectivity and VoIP services.
A solar panel atop a shrine provides power for the mesh network.
[image from the Tibet Technology Center http://tibtec.org/]