good link on ADIZ
"Editor’s Note: China’s establishment last November of an Air Defense Identification Zone (ADIZ) shook many observers, who feared it was a first step in a more aggressive Chinese foreign policy. Here at the Foreign Policy Essay, we’ve already taken an early look at the issue. However, as the months have passed and a crisis has yet to emerge, analysts are beginning to take a second look at the issue. Eric Heginbotham, a senior political scientist at the RAND Corporation, contends that the reasons for China’s decision to establish the ADIZ are often misunderstood and that U.S. policy needs to focus more on China’s actual behavior, not the zone itself."