Two August birthdays and my mom's wedding / family reunion were the justification for our purchase of the Nintendo Wii a few weeks ago. It is a unique game console because it works off of remote controllers that sense your movement - so for example, you can "play" tennis against your virtual opponent.
I thought this would be all hype, but let me tell you - the Wii is fun! We have had people of all ages, shapes, and sizes delighted to swing a golf club, throw a bowling ball, or even give a couple of right hooks in boxing. This should DEFINITELY be on your Christmas list!