The success of Nintendo's Wii gaming system has been a demonstration of user centered product design. Nintendo, Sony and Microsoft introduced updates to their gaming systems in the summer of 2006. Both Sony's Playstation and Microsoft's Xbox redesign emphasized high end technological advancements in picture quality for the hardcore gamers; whereas Nintendo focused on interactive features (i.e. bowling, tennis..) that made gaming more accessible to families.
The market place has decided that Nintendo's strategy is a winner based on consumer demand and sales figures. This summer Nintendo extends their brand into the fitness arena with the introduction of Wii Fit software and balancing board.
USA Today Article
NY Times Article
Video Review of Wii Fit