I watched a HD NFL game the other day at some relatives' house on an LCD RPTV. It looked fantastic as long as the players weren't moving quickly. When the action started there were tracers and blurry images everywhere, unfortunately.

I'm considering an HD box, but my TV only has one set of HD component video inputs. I'll lose my progressive scan DVD picture unless there is a way to run both signals into the same input. Maybe simple RCA 2:1 splitters will work?