Al Qaeda's Internet communications system has suddenly gone dark to American intelligence after the leak of Osama bin Laden's September 11 speech inadvertently disclosed the fact that we had penetrated the enemy's system.

Want a leak worth investigating? How about this one. Who in the government leaked this to ABC, and why? I have my suspicions, but this is a case of releasing specific, secret, legal, methods and means. That places this in an entirely different category from other leaks (black sites - not legal, nor specific. wiretaps - again, not specific, not secret, and probably also illegal).

Qaeda Goes Dark After a U.S. Slip - October 9, 2007 - The New York Sun