It's best to let the editors of The New Colonist tell you what they're all about: "The New Colonist is a web publication for people who love and live in cities. It's not only about the cities themselves, but about life in cities. It's not only about the biggest cities we always hear about, but about the idea of a city as a colony of people growing together." I've recently started contributing a regular feature, titled Citysongs.
Check out the rest of The New Colonist while you're there.