ROFL.
I like the idea too. I actually liked the Kirby Tilt n' Tumble idea Nintendo had for the original connectivity, where you played the game on both screens, but I guess it won't work as well with DS since it has no motion sensor built in. You could add one, but is that worth it? Also, the DS having two screens of it's own makes the two-screen concept kind of moot, why not just make the game for the DS?
Umm, yeah, so I have no good ideas right now.