http://gonintendo.com/viewstory.php?id=110040
According to GN and Engine Software, the tilting is pulled off due to the DSi Camera's placement. This seems pretty good and I'm sure you guys must be wondering if this is the motion sensing we've been waiting for.
Just share your thoughts in here!
Might be cool for the odd effect here and there in a game like Chinatown Wars, though.

at first i thought it was just the screen, but i closed it and it was still there! So i held down the L and R buttons, and it was STILL THERE. I think you mite be on to something.
someone could take apart there ds, and see if they find anything, I know I saw some people do it on youtube, but they were simply taking it apart.