My setup is: HP XW8400 with the NVidia Quadro FX1500 and 2 Dell 2407WFP-HC monitors. When I try to record NTSC video by pointing the camera directly to the screen, I am getting some lines.
Here is a sample of what is happening:
http://www.youtube.com/watch?v=TnApFzmd9NY
Notice that the ViewSonic monitor looks good but the Dell has lines in it.