I've been to a number of North American airports. I don't know about what changes have happened, but based on how things used to be, I would recommend flying out of Canada.
I guess you have to put confidence in those that are responsible for the security. Recent happenings have made everyone more aware of these concerns, so I would have more faith now in security than I did prior to 11 September.
I agree that a public forum isn't the place to discuss specific security measures.
Matthew.