The use of pre-paid mailers would be another option that may be useful....many people do this and have some of the photo's waiting for them when they get home.
As mentioned, multiple passes through x-ray machines will eventually fog film, and the higher the speed of the film, the more susceptible it is to the damaging rays. "They" used to say 1600 + speed films were most susceptable, but that was before Kodak and Fuji started hawking 800 speed films for everyday consumers.
FAA guidelines provide for the traveler to request a hand inspection of film. Not all screeners seem to know or care about this, but maybe that will change once trained federal employees take over all of the screening functions in the US. I'm not sure how hand-checking works with International travel though.
The last time I flew (going on three years now...time flies, even when I don't), the people in Orlando actually swabbed every roll and canister looking for traces of explosives. Took an extra 10 minutes, but that was well before our 'extra security' went into effect.
What I always wondered about were the lead x-ray bags for photo film. If it's lead, it blocks the x-rays, right? So if it blocks the x-rays, how do they see into the bag to see that its film canisters in the bag? If they make you take the bag out so they can search through it, why not just hand them the film in the first place? What am I missing here?!!?!?!?!
-Joe