Just back last week from Orlando via New York. When we flew out security was very tight with Continental from Edinburgh. We had to remove socks and shoes and they even looked at the soles of our feet ! We also had to remove any loose layers of clothes and put them through the x ray ( jumpers, cardis, fleeces etc ) essentially stripping off until we only had a t shirt on. All loose change and everthing must come out of pockets and camera and camcorder were taken out of bags, swabbed with a spnge thing and put through a seperate machine to test for explosives I think.
Then on arrival in USA it took about 1 hour to clear customs. Passpots were studied a lot more than previously and of course photographs and fingerprints were taken. This seemed to cause more delay than is probably necessary......old people were a bit confused and non English speakers seem to hold things up. Knowing which is your Index finger helps enormously ! ( This is the one that is fingerprinted ) It did seem as though quite a few people were getting either sent back to complete forms or taken to another room ( glass fronted with quite a few people in ) for further questioning I assume. Customs also seemed quite stroppy in their attitude and when I heard one lady complain about the wait they pulled her to one side and made her empty all the carry on luggage. This happened on the internal American flight, Americans do take huge amounts of carry on luggage so the wait time was long to get x rayed as we left New york to go to Orlando.
All in all i reckon you just have to relax and go with it and dont be heard to complain. Security is just going to get tougher and tougher so we may aswell get used to it. I think apart from the hassle factor its reassuring anyway.
If I can answer anymore questions just fire away !