Aristotle's "Man is a political animal" means, as you know, that man is an animal who lives in a polis. Most normal folks prefer to live amongst others, to cluster, whether for convenience, socializing, or for security. I happen to enjoy both town and country, and find suburbia to be an imperfect if often necessary compromise.
Urbanism is about studying cities and towns. The topic has always been of interest to me, whether from the archeological view or from the present view.
Our blog colleague with his shiny new site The Old Urbanist (a word-play on The New Urbanism) blogrolls several sites which I have found quite absorbing and informative:
City Block
Market Urbanism
Infrastructurist
Of course, our old stand-by City Journal is also really an urbanism website.
Image is of Babylon. Nice place to visit but I wouldn't want to live there.