Since the design of Wii is so innovative (e.g. the remote), one obvious challenge is to educate the consumers about all the new stuffs … even before they buy the game console. What approach is better than video clips ? And of course with the help of Internet, the cost of distributing these video clips to potential consumers is practically zero.
You can find dozens of Wiideos in Internet, some by Nintendo, some by other professional animators / graphic designers (e.g. www.super78.com). Here are some clips I really really like: