I've never been a fan of console games, in spite of the kids having bought an xbox and borrowed a friend's gamecube. But this Wii thing looks interesting, since it actually requires you to move something more than your digits.
One thing that always kept my interest in arcade games was the quality of input devices. Driving games like OutRunner that slam you to the side when you turn hard, and a game I spent (too) many quarters on Hard Drivin', the first one with a decent physics engine and a steering wheel with force feedback. More recently, I like to play Police 911, with the excellent interface that detects your body position and uses that to control the point of view of the camera. (Konami has brought out a PlayStation 2 version of it, I haven't played it).
The Wii looks attractive to me both as a player and as a parent. The idea that a kid has to get out of his chair and move around to use the Wii's wireless motion-detector controls has got to be a step in the right direction, both in terms of game play, but more in the realm of actually developing some physical skill and expending some calories. If that looks promising, it might be the first video game console we have in the house that the parents are actually happy to buy...