While the picture from an upconverting DVD player looks good (make sure the player supports 1080p upconverting!), the overall sharpness is still inferior to a true high-definition HD-DVD or Blu-Ray disc, since the upconversion introduces weird effects if you see the small details on screen.
If I have a 720p HDTV, do I have to make sure that the upconverting DVD play is 720p, or doesn’t it matter? I’m a newbie to this HDTV stuff....