Two problems with your answer:Originally Posted by T3kNi9e
1) It's not 420p, it's 480p and...
2) 480p is NOT high-definition. 480p translates to 720i. Only 720p or higher is considered high-def. 480p is just progressively scanned and will produce no better than a top quality, standard-definition picture. Component video cables will produce a better looking picture on your tv because it a purer, less-filtered signal than composite (yellow video cable) or S-video.
So the correct answer is no, the Wii does not support HD.