Does the TV have a DVI type input as well?... if so you could probably hook you're HDTV Cable Box or DVD player (if it has the output) to that. But this is how I would hook them up:
EDIT: I missed the part with the non-progressive DVD player
Component:
GameCube
XBOX
S-Video:
PS2
DVD
Composite:
VCR
HDTV Cable Box (if no DVI input)
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