DVD Benchmark's Progressive Scan Primer. (Thanks qJason.)

We also want to warn you: if you have a progressive-scan DVD player that you are happy with, you probably should not read this report. With some of these artifacts, you are much better off not knowing they are there, because once you start to notice them, they’ll drive you nuts, and then you will inevitably need to replace your player. We’re quite serious here – it’s happened to us....