As Hank Rogers says: Come on guys, get real!!
All this searching for knives and panic all around is a bit ridiculous. I mean it's good that we make our thoughts about security and take appropriate measures. However, to fall from one extreme to the other makes no sense either.
Cockpit doors closed all the time. I don't like the idea. How's about the whole topic of CRM (remember it's called CREW Resource Management, not COCKPIT Resource Management)!
Also the big discussions about the knives at the moment. If we can remove all the knives on an airliner then what's about all the other items (glas bottles, scissors from the first aid kit and so on...)??? I guess if they want to bring an airliner down, it will be always possible. As you have seen their imagination is sadly always beyond ours.
I think the industry has to evaluate the whole situation carefully and then take appropriate measures. I just hope they don't overreact now. However, don't take me wrong, I agree that this was a horrible act of terrorism which has to be punished.