[quote name='fred_h_haddad']We're not discussing composite. We're discussing S-VIDEO vs. component. I don't think an old-fashioned analog NTSC set will show any difference because of the nature of the beast.
Hence upgrading from an S-video cable to a component cable (for an old analog set) would be a waste of money. IMHO.[/quote]
I can't say on the Wii, since I don't have an S-vid cable, and am awaiting my component cables...
But I can say this:
On our "old" 36 inch Panasonic in the kids "playroom", I can see a marked difference in color saturation and Picture Quality, when using our DVD player, between Svideo and Component hook ups. Part of that is probably the fact that progressive scan capability is ONLY available via component. I tend to notice less signal noise, as well, but I can't be 100% sure thats not just the difference in cable quality (the s-vid cable, the "normal" hook up for the playroom, is a cheapy).
I agree, the differences between S-vid and Component, on an SDTV are subtle and perhaps not worth the extra expense. The difference is if your tv supports progressive scan over Component video. Then, I think, the difference is more dramatic and worth the extra cash.
So it all comes down to how old is old. Only the OLDEST of the sets with component, I think, don't support progressive scan. If yours does, I think it's worth the upgrade. If not, it's probably not as the differences you'll see are minimal.