I was just thinking, every one of Nintendo's previous handhelds has had a way to play them on your TV--the Super Game Boy for GB and the Game Boy Player for GBA. A lot of people would like to see this on the DS, but there's the obvious problem of needing to watch where you're putting your thumb/the stylus. Of course, there would be no way to translate this over to a tv screen with the DS Lite.
Now, I was thinking, one of the features of the DSi is a camera mounted on the bottom of the top screen. Given that, wouldn't it be possible for the camera to be used to show the position of your thumb on your television screen?
What I'm suggesting is this: the television screen is split in two, top screen on the top half, bottom screen on the bottom. I'm wondering if the DSi camera, aimed downward, could project your thumb on top of the touch screen, allowing you to play DS games on your TV with relative accuracy?