Declan McCullagh
Mr. McCullagh must at very least lurk here, but I'm guessing he's an active participant. I was quite intrigued to tune into cnet.com to find a link to his article on the scanner backlash. It never mentioned Flyer Talk, but it seemed to be very aware of all the anti-scanner activity in cyberspace.
I think his article is the first I've read in what might be called "the mainstream" about the smoldering anger against TSA technology.