I haven't yet had my carry on searched on a domestic flight. Even on an int'l flight recently departing from IAD they did not search my carry-on. Only x-rayed it.

I wouldn't fret about this too much though. There are a million ways for terrorists to commit acts of death and destruction and if you just go about your business without worrying unduly about it I think you are a lot better off.

No question about it, airplane security is going to keep improving. They are going to scan bags, they are going to scan luggage, things can't change overnight but they will change rapidly, you can bet on it.