Carry on is now limited to ONE per person. That means your briefcase/purse/backpack PLUS one carry on. Anything else has to be checked.
If you are taking a camera case, make sure it is the carry on: they are using much more powerful xray machines for check in baggage and are warning that any film will probably be ruined by going through them. Be prepared to open up the case, as there is a lot of hand searching also on cameras.
As already mentioned, PCs are being taken out of their cases... you are asked to turn them on. Again, also some cameras.
DO NOT carry anything like Swiss army knives, clippers, nail files, etc., etc. in your carry on. It WILL be confiscated! If you need it, pack it in your checked baggage.
BTW, there IS some curbside check in.... depends on the airport.
~SubMariner~