Nintendo has one goal in mind with the Wii: Get everyone to enjoy it whether they play video games all day long or not at all. For a house-hold name like Nintendo, it won't be easy to get it accomplished, but Nintendo is very focused on it. Since non-gamers typically complain that video games are too complicated (and the creator of Mario and Zelda agrees), Nintendo is getting into Innovation to not only make games feel more natural, but to also get hard-core gamers something new to play with. Not just an upgrade in graphics.
Now, some people may have heard that the name of Nintendo's next-generation console was "Revolution". Well, that was a good name and all, but Nintendo didn't think that it was a good name for what they're going for. Sure, they want to revolutionize the way we play games, but they mostly want to revolutionize WHO plays games. So, Nintendo chose the name "Wii" instead. It is pronounced as "we" as in, more than one person. The two I's in the name also stand for more than one person. Nintendo chose a short name so it can't be abbreviated because people out there still don't understand what NES or PS2 stand for. Wii is also the global name, so if you walk around Tokyo shouting "Wii", people will know what you're talking about.
As you could imagine, the name "Wii" has recieved its bit of criticism. In the Japanese language, "Wii" cannot be pronounced (though it's much better than saying "Revolution". In America, fanboys have called the Wii a bunch of potty jokes. Nintendo hopes that the name could catch people's attention, and when the name was first shown, it sure did. Nintendo even had the name's spot in the marquee reel on CNN.
The Wii really isn't made to be the most powerful system, but being the least powerful system does have its advantages. The size of the Wii clearly shows it, being less than half the size and weight of the Xbox 360. If you stack three DVD cases on top of each other (cover to cover), that's about the size of the Wii. What's great is that now you won't have trouble finding a place for it, which might be a problem for the big and bulky Playstation 3. To be exact, the Wii is only 8.5 inches long, 6 inches wide, and is less than two inches thick.