I don't keep a list so checked my carryon pockets to see what's there, just a few things there that haven't been mentioned (or could be again):

+1 on plastic spoon/fork. I carried a spork then promptly lost it, I think to a Capuchin monk...
+1 on maps, city and country at least. Sure, you can have this on your electronic device, but without a device you're lost again. For years I made it a practice to always carry mappage to route me all the way home via roads and highways. For the life of me I can't navigate from Atlanta to Seattle without a map or three. Too much good bbq to pull you off your route...
nitrile gloves, stuffed in a 35mm film container. Have come in handy particularly with ill fellow passengers. Flight crews have them but won't hand them out quick enough to make any difference.

Sure, air travel ain't as fun anymore, but some of us have to fly, and I've always allowed alot of time to get through barriers. Until recently the xray route has always saved me time over the other security options - getting pulled out of a line for an xray, instead of standing in line for regular inspection. It can really save time at Heathrow. But on the whole I haven't seen any difference in security except for those who insist they don't want the radiation, to each their own.

Also if you are low risk and a frequent international traveller I can recommend the Global Entry program, you check in at a kiosk rather than wait in line with others at passport control. I think its $100 for 5 years - but again, some folks find that level of prior inspection (background check) intrusive. I've been through enough background checks though it really doesn't matter to me. I'd rather front load it than wait for a border guard to perform his own analysis in real time, and maybe force me to dump out my carryon for his inspection.