I'm an iTunes amateur, but the girlfriend is all "Go Mac!" -- that being said, wouldn't it be easiest to connect your iDevice directly to your TV via Apple's expensive HDMI adapters?
If you're talkng about trying to view the movie files themselves on other devices I'm pretty sure that Apple is so proprietary that they make it so you can't watch them on anything but your registered iTunes product. Again, I may be wrong here but that was my understanding.
Now if they were regular .AVI or .MPG movie files you were trying to view, there's options out there for that.