I travel monthly.
computers and projectors need to be taken out of their bags and put in their own bin (by themselves)
you must take your shoes off.
you must take your jacket off.
go through the motions, put all your shit on the conveyor and in the bins.
remember to remove your keys, phone and belt (if you have a large buckle)
Keep your ticket/boarding pass and wallet with you at all timesWatch all your stuff go into the xray machine BEFORE you go through the metal detector.
IF for any reason they want to hand screen anything, collect ALL your crap before leaving the output of the xray machine (they
will wait for you)
laptop tip: tape your business card to the top or bottom of your laptop to make it readily identifiable as yours. a BFL sticker would be nice

eta:
1. go to the tsa website and readup. know in advance what is/is not permitted. Print a copy of those rules. You're expected to know them, at the same time, the TSA should damn well know them. Stand your ground to those rules and ask for a stupidvisor if the "agent" is giving you a hard time and you know better.
2. walk through the CENTER of the metal detector. too close to either side if you have a watch on, could cause it to go off. Generically speaking, detection of a large mass of metal is what sets them off. (I used to service all the equipment you see in the check point (and some you do not see.) follow my advice and you'll do just fine.)