An excellent blog post has been made here: http://scienceblogs.com/effectmeasure/2009/12/whats_next_we_fly_nude.php
However I think an important point is missing. This attempted bomber was KNOWN to the authorities. But not enough that anything was done about:
* A subject known to the authorities as a risk
* His father warning said authorities
* His 2 week flight to the USA without any hold luggage
* The timing of his moves from Yemen (home to quite a number of threats) to Nigeria to The Netherlands to the USA
It seems to me that we do not need any new security measures – it would be better if we actually used the information we already have and make sure that potential threats are properly acted upon. If all the warning signs had been acted upon, the bomber could have been put through special, targeted security measures. Like El Al use.
Theatre may make people FEEL safer, but proper intelligent use of information MAKES us safer.
PS Why are we only worried about the bomb going off in the last hour of flight? Surely the terrorists would rather take out a plane mid Atlantic than not at all?