For some odd reason, there was one clip in a video that I did that juddered more than the rest of it, like it was being field bobbed even though the file and output were interlaced, I couldnt get rid of it in the end so I just left it, it was only a few seconds long....
However, you need to watch that interlacing nonsense, as on a PC display it may appear liney, but that's not always cause its interlaced as Media player 10 etc all deinterlace interlaced footage, sometimes it's because software (Example is Adobe premier) Can't actually scale interlaced footage properly, it has to be deinterlaced first, watch out for that as if you scale it down the image will apear to judder back and fourth when played on a TV and if you scale it up it'll have a "ripple" effect.
It's not about what camera you use or how much it cost.
It's about what you shoot,
how you shot it,
and how you edit it :P