Bruce Schneier lives in an interesting middle ground between cryptography and journalism. This perspective gives his essays on security an uncommon and refreshing bias toward common sense. His latest, "The War on the Unexpected", should be required reading for every employee of the Department of Homeland Security and the TSA, not to mention every living soul in Boston.
Nothing I could add would help. Just click here and read for yourself.
Disclaimer: Bruce and I worked together briefly around the turn of the century. That fact doesn't make this essay any less brilliant. It's just why I always read his writings.