Ok... First off, I do support airport security and terrorism is not a laughable matter... but the more I read the CATSA regulations regarding International flights into the US the more I want to knock some sense into these people.
http://www.catsa.gc.ca/file/library/71/English/Exempt%20Items%20(08jan10)EN.pdf
Basically... If you read the list of what you are allowed to take on a plane nothing has changed... The only thing is you can't put it all in one bag... so my book or magazine is allowed, as is my laptop, and my daytimer, and my camera, my ipod, and some snacks, and I could bring knitting needles (if I brought wool too...). But I just can't carry them in a bag...
Besides...wasn't the explosives in the guys shoes & underwear? Why not make us all travel barefoot and commando?
Now I don't think these restrictions affect those of you originating from the US but keep it in mind, they will for your return flight from Mexico...
Hopefully they will realize the irony and lift the "no carry-on" restriction... since... really the carry-on is not restricted anyhow... just the bag...