Nintendo Wii

Amid fierce rivalry in the game console industry between Sony's Playstation and Microsoft's Xbox during the early 2000s, Nintendo went off-piste and created a console that allowed gamers to get physically involved in the virtual games they were playing. The Wii controller detects movement in three dimensions, and can be used as a fitness device. It went on to inspire a number of other motion controllers including Microsoft's Kinect. 

Source: http://www.telegraph.co.uk/technology/picture-galleries/11298840/Most-important-inventions-of-the-21st-Century-in-pictures.html