It's not easy to view NTSC video input on a Windows box, but thanks to Ask MetaFilter I figured out how. Here's what you need:
It's amazing how complicated this is. It's a lot of data: I'm surprised my PC can record full motion video to hard drive. And the NTSC input is in an awful format. The interlacing is the worst of it, here's a nice visual explanation. There's a neat program called DScaler that tries to deinterlace the video before displaying. That gives a much sharper still picture but in regions of high motion you get awful judder. I gave up on it.
Progressive scan HDTV is the only rational thing.