The media, the blogosphere, and US politicians are divided (except perhaps those US politicians who are exempt from any screening). Some lean one way or the other. Some note that the Israelis don't use AIT. Some writers are having their cake and eating it. In This Junk Won't Fly: The idiocy of airport-scanner "Opt-Out Day" William Saletan argues we shouldn't opt out because doing so will cause inconvenience to all travelers. Saletan wasn't quite so sanguine about the privacy violation back in his March 2007 piece title Digital Penetration: Invasion of the naked body scanners.
I'm traveling by car this weekend so I don't have to decide. How about you?
Updated 23 November to add: Actually I do have an opinion...
The TSA has reacted predictably to every new mode of attack by implementing a more intrusive inspection regime. Al-Qaeda says "Boo" and the next thing you know the TSA is looking at naked pictures of our mothers, wives, and daughters? What happens when some unsuspecting trans-Atlantic drug mule fills his colon with Semtex instead of a heroin shipment? Will we all line up for preflight abdominal x-rays or opt out and submit to body cavity inspections?
Terrorism may seem like a big problem, but our collective fear of terrorism and the ability of others to profit or accrete power as a result of that fear is a bigger problem. We're going to stop over-reacting sooner or later, why not now?
Updated again on 25 November...
Initial media reports were that National Opt Out was a total bust. Now, it seems that one of the reasons air travelers did not opt out much at all on Wednesday was because the TSA appears to have quietly turned off their AIT machines, eliminating the need - or the option - to opt out. An interesting, if transparent (please excuse the pun) solution. So, if the TSA is convinced we cannot fly safely without the AIT program, on what grounds, and on whose authority, can they choose to turn off the backscatter and millimeter-wave scanners on the busiest travel day of the year?