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Sky Render said:
S-Video, while miles better than standard composite video, is still technically the same type of feed as composite. Ergo it does not support progressive scan and usually does not support widescreen (certainly I've heard of no TVs that can output an S-Video signal in widescreen, but I suppose it's possible). S-Video cables are sold for the Wii from third-party peripheral makers, as are component cables.

There is technically no difference between a widescreen signal and a standard 4:3 signal, at least not over analog cables.  It just sends each line as an analog signal, and your TV fits the line to the width of its screen.  S-Video, Composite, and even RF all "support" widescreen (there's really nothing to support).   You're right that S-Video doesn't support progressive scan, though, as that requires twice as many lines to be sent.

 

@wiiforever: 

Red, White = stereo sound
Yellow = Composite video (lowest quality)
Black with little pins inside it = S-Video (good quality)
Red, Green, Blue = Component (best quality, supports progressive scan)

There's not much reason to go with Component over S-Video if you have an SDTV with no progressive scan, but Component is the way to go with an HDTV.