Carry-on luggage has got to be one of my biggest pet peeves, right next to 5'-0" people peeking out over the steering wheel of huge SUVs, but thats for another time and not here.

I agree it annoys me to the utmost, even when I don't have carry-on luggage myself. Unfortunately, I don't ever see it regulated, and of course it just holds everyone up trying to board and only aggrevates the few that do obey the rules. I'd be willing to make a bet that 80% of carry on luggage can't fit into those boxes at the gates where they say your luggage must be able to fit in.

Oh well, all we can do is complain enough and maybe the airlines will start to hear us.