Secret weapon used by US in Iraq

Greg Greenwald blogs:

I asked [Bob Woodward] this question about the claim Woodward made last week that the U.S. has achieved a new technological "breakthrough" allowing it to use a super-innovative and advanced weapon in Iraq (which Woodward says he knows about but refuses to describe), and Woodward's reply to my question is here (and my further reply/question is here).

This is what Woodward told CBS News'60 Minutes:

This is very sensitive and very top secret, but there are secret operational capabilities that have been developed by the military to locate, target and kill leaders of al-Qaida in Iraq, insurgent leaders, renegade militia leaders. That is one of the true breakthroughs

A writer for Wired magazine speculates what the weapon could be:

I'm going to make a wager about what I think Woodward is talking about, and I'll be curious to see what Danger Room readers have to say. I believe he is talking about the much ballyhooed (in defense geek circles) "Tagging, Tracking and Locating" program; here's a briefing on it from Special Operations Command. These are newfangled technologies designed to track people from long distances, without the targeted people realizing they are being tracked.