>>3 Ah, that kind of Component. I never understood the naming system for that connector, it's confusing.
Anyway, I know they certainly didn't make any convertors back when the SNES was first out, so I really think you'll have trouble finding something that isn't a $60-$70 convertor box for that one. As for the Gamecube and Xbox, I know you can get capture cards that output to USB, so if you have a laptop you could connect the card to that and connect that to the TV. It's a workaround, but it's something my friend does. Actually, I think you could do that with the SNES too.