The screening of CHECKED bags is the biggest issue with film, don't put it in your checked bag exposed or unexposed, too much potential for disaster there. The screening of CARRY ON bags, a little more leeway. The xray equipment has the potential to harm any type of film, but generally anything under 800 speed film will be fine. Also, it's the cumulative amount of passes through that you want to be concerned with. Once down, once back, shouldn't be an issue.
As for hand screening bags and items. They are SUPPOSED to do it by passenger request. However, some are a little nicer about it than others. In my experience, MCO personnel are horrible about it. (I really want to believe it's not everyone, but it has happened to me on multiple occasions, encountering a terribly rude TSA employee when politely requesting a hand screen. One such employee actually grabbed my bag of 35mm film rolls from my hand (which, incidentally, I had taken out of their cannisters and put into a ziploc as recommended to make things easier) and tossed it onto the belt and sent it through before I could even finish my question. Another huffed at me and yanked a camcorder tape from my hand, hand screened it, and then practically slammed it down on the counter when they were finished. (In this instance, I even had handy the email from the company which makes the tapes, they recommended hand screening to avoid potential damage.)
I am so glad I have gone digital for a variety of reasons, but not the least of which is not having to deal with the above. My home airport incidentally (BDL - Hartford, CT) is awesome about things such as this. Not much experience elsewhere, but even post 9/11 I had an easier experience in WASHINGTON D.C. than in Orlando.
