Here's some nice uses of the touchscreen:
- on screen keyboard (as if i need to say this one)
- turning the console 90 degrees on its side and using the touchscreen as input can be more suitable for certain things (like brain age did for DS)
- gesture inputs
- allowing users to draw shapes to control games [video] (this one's very interesting)
- note taking ingame, you wouldn't believe how much it can enhance gameplay - especially puzzles (ie. Zelda Phantom Hourglass)
- on screen keyboard (as if i need to say this one)
- turning the console 90 degrees on its side and using the touchscreen as input can be more suitable for certain things (like brain age did for DS)
- gesture inputs
- allowing users to draw shapes to control games [video] (this one's very interesting)
- note taking ingame, you wouldn't believe how much it can enhance gameplay - especially puzzles (ie. Zelda Phantom Hourglass)