Knock on wood--so far I haven't had any problems getting through security with my camera gear, although I can't say that for other things that I've tried to carry on. The only piece of gear that I will check is my tripod and it's a $40 tripod, so it's not that big of a deal. I'd like to get a smaller tripod that I could fit into a carry-on, but I'm still concerned about whether it would pass muster with security.
One thing that I have read is that carbon fiber tripods can get through with no problems, but in the minds of the airlines and security, aluminum tripods can potentially be made into weapons (who says you can't beat somebody upside the head with a carbon fiber tripod?).
As for taking film, what I would do is not load any film into the camera until you reach your destination (unless that's the only body you're taking). Without film, you can send the body and lenses through the xray without any problems. If you do have film already loaded, just leave the camera out and ask for a hand inspection. As for the film, simply put all of it in a zipper bag and let them hand inspect that, as well. With that said, that's one of the reasons I'm thankful for digital.
BTW, the last plane trip I took, I put my gear and other things into a LowePro CompuDaypack and didn't have any problems at all. It also fits nicely under the seat in front of you.
I've since gotten a smaller setup, which I will put into a small roll-along carry-on suitcase, along with everything else I want to carry on. Once I get to my destination, the smaller setup will be easier to handle when I'm actually out and about.
HTH,
Heather