ETK is working on a Pong Game for the DS, heres what he has posted:

I have improved it a bit, new gfx and added some missing collision, it doesn't works like I want to ... maybe I can fix it tomorrow

v0.1a updates:
-New GFX
-Added an effect to the balls
-50% of the code has changed, it's more readable now
-Code optimized
-Fixed time counter bug
-Added a 'Press Start' screen

Download at his site here --> http://etk.scener.org/