Interesting reading Alexander the Average: Houston, We Have a Problem: Exploring the Impact of Nuclear Terrorism (Part 1) and Part II. (Hat tip: Winds of Change)
We used to train for being attacked by a nuke in the Navy, and in my elementary schools. Once I remember a practice evacuation of an Air Force base when I was small child (we evacuated to Yosemite - not too bad, really). But are we really ready, without some practice, to evacuate Houston, New York, San Francisco, LA, Boston, Charlotte, Norfolk, Washington?
Update: See this earlier post on stopping nuclear terrorism.