Touch-sensitive controls should be avoided, to allow tactual exploration.
The camera's body is touch-sensitive, which allows glove-wearing shutterbugs to keep their mitts on when snapping photos.
The other most notable change is the inclusion of a touch-sensitive strip along the neck of the guitar.
Located in between the regular fret buttons and the body of the guitar, this touch-sensitive strip can be used for the "slider gems" portions of songs.
Touch Screen - The lower screen on the DS is touch-sensitive, much like modern PDA systems.