My company has an office in Florida. I am flying back from my second trip there. Both times I've smuggled contraband on the plane. By contraband I mean items that I can't technically take on a plane, but would not make effective weapons.
The first time I traveled there I brought a larger than 10 oz container of body wash in my carry on. As JFK they just didn't notice it. It was confiscated on the way back at FLL. The second time I brought network cable crimping equipment on. I was told by the TSA employees at JFK it was ok. In line for scanning on the way back a read a sign that specifically forbid tools such as screwdrivers and hammers. I think a crimper, punch down tool and wire stripper fall into that category. Somehow I make it through screening.
This is what I don't like about the war on terror. I don't know enough about security to be able to make statements about the usefulness of flight regulations. However, I think that not enforcing them is probably a bad idea.
These sorts of incidents eventually lead me to think how I would behave if another passenger on a plane I am taking announces he is hijacking the plane, I plan on making it very clear they will have to kill me before they bring down the plane. Of course being unmarried and childless I have the luxory of being able to make principled stands like that. At least in my own mind I do.