I'm pretty sure that at least a few WiiChaters here have some pretty good ideas on games for the Wii and I was curious as to what those ideas are.
An awesome game I thought would be cool for the Wii is like a Battlefield 1942 game, but based in Medieval times.
To where your right hand you use as your sword and your left hand as your shield or vice versa and maybe for the two handed weapons, both. Also, for bow and arrows, you would have to aim the numchuck like a bow and then use the Wiimote as if your getting an arrow and actually shoot it like an arrow.
Also, it would have some awesome physics, like if a catapult would hit a wall of a castle that part of the castle would break and kill those that are on it.