The Nintendo Wii
The Nintendo Wii is exceptionally different than the offerings from Microsoft and Sony because instead of focusing on raw performance, Nintendo set out to change the way people played videogames. The Nintendo Wii-mote and Nunchuck controller allows players to use physical motions to control on-screen action rather than an analog stick and buttons.
A sample of what Mario Cart on Wii has to offer
The Wii's controlling method can be extremely fun in group & party-oriented games (Boom Blox, Zack and Wiki: Quest for Barbaros' Treasure, Wario Ware) and select sports and action games (Wii Sports golfing and bowling and Star Wars: The Force Unleashed), traditional gamers might not enjoy the "pick up and play" aspect of some games (Madden 09, NHL 2K9, Pro Evolution Soccer) that seek to level the playing field between a novice and a professional.
For all intents and purposes, the Nintendo Wii is a child and family-oriented console. This isn't to say that mature games do not appear on the Wii, just that there are noticeable amounts that don't (Tom Clancy's Endwar, Grand Theft Auto 4, BioShock). And the mature games that are available on the Wii (Resident Evil 4, Call of Duty: World at War) are over-shadowed by the amount of kid-friendly Nintendo games (Super Mario Galaxy, Mario Kart, Legend of Zelda, Animal Crossing).
Nintendo's Wii console has changed the way we interact with videogames and continues to innovate with such products as the Wii Fit balance board, which promotes health and well-being through their Wii Fit and Wii Sports games.
The Wii does not seek to become a home-theatre replacement as it provides very little internal storage and does not play DVDs. As always, Nintendo has a very strong showing of quality first-party games available, but the lack of mature multi-console games is hard to overlook. The Wii's online play is somewhat archaic requiring excessively long friend codes to coordinate game play among friends.