The dodge ball game seems like it would be no different than the WiiBalanceboard game. So though the input would be entirely different, the game concept would be the same. If you can, I'd mess around with that soccer game before you start investing all your time and energy into it. Here's a video if you're un-familiar.
http://www.clevver.com/games/videof/198008/wii-fit-trainer-demonstration-soccer-heading.htmlAs for an FPS... for obvious head tracking reasons, this seems like the genre to go with. If that's what you (or we, since I'm very interested in helping) decide to go with, we'll have to figure out what purpose the head tracking plays. Is it to look around, dodge, peek around corners? Will you only use the head tracking, or will you couple it with a mouse?
It seems to me that unless there's some fancy gameplay to go along with it, using the head tracking coupled with a mouse wouldn't warrant anything exciting. It would just be there with no purpose other than to be cool... so yeah, a good brainstorm session about that would be necessary.
I was thinking about using the head tracking as a way to zoom in and out while playing an RTS style game. This seems like it's more integrated into the system, but then again, it's not as exciting as an FPS. Check out this powerpoint thing I made over here:
http://www.wiimoteproject.com/project-ideas/single-input-stylus-rts-game/To explain how the head tracking would be used in that game is like looking through a desk that it's projected onto into the virtual world like a port hole. So instead of immersing yourself into the game first-person style, it would be you moving closer and further from the screen to see either a wider or a smaller plane, as well as the angle depending on where your head was at. Let's see if these pictures do the trick. You'll see that I love pictures describing what I mean... for the RTS concept, I have the game screen projected on a desk with the head tracking wiimote camera placed towards the back wall. I'm invisioning this projected onto the bottom of a glass desk with a diffuser paper to focus onto. The IR pen would be bright enough to be seen through the paper under the desk if it were pressed on the top of the desk, but the glasses would be too far away to get registered because of the diffusing paper.
Really close gets you closer to the characters, and gives you a wide viewing angle.
Further away gives you a smaller cone of vision, but you see the screen better.
Sitting normally at a desk, notice the angle that you see more parallel to the ground.
Look like a dork playing a videogame with your nose to the table. You can see the horizon with this angle.
Anyway, it seems like it would feel natural. You could move your head around to see different units to select that are currently off screen without having to move the camera via the mouse/keyboard/pen input.
So that's my current idea. Just because I put up pictures doesn't mean I'm hell bent on making it happen, it's just the concept I've had mulling around my brain.
