The nytimes.com has an article on what I consider a precious addition to any city: the streetcar. While subways and buses can move masses of people, streetcars add a quality to the urban landscape that the others cannot (save London’s doubledecker buses). I believe that any city that can get streetcars should get them. And unlike other modes of transportation, age adds to their appeal (as I can attest to, having travelled on some old streetcars in places like San Francisco).
See the slideshow here, Desirable Streetcars.
There’s also an article.