How many lines for standard TV, HDTV, DVD, S-Video

I recently started using my S-video connection to my Sony TV from both my DVD player and my satellite system. the beauty of S-video is in the delivery. You can't get more lines from your TV screen than it can give you. But the S-video connection breaks the image down to the original Red, green and blue colors and it piggy-backs the form onto one of these feeds. You get a much better picture. I use a little $49.00 box from Radio Shack to control which source (satellite or DVD) and this box even has a remote. Another thing I discovered, by accident(I sat on the TV's remote...) was that by running the satellite through the S-video and using the left/right audio inputs, and connecting the cable TV out let to the normal cable TV-in at the TV, I get my picture-in-picture feature back.