For as long as the DS has been out, I can't believe that no one has developed a Jeopardy DS title yet!....
The DS is PERFECT for this game:
One could use the mic for answering questions (or "questioning" answers, rather )
One could also easily write in their name, wagers, and final Jeopardy questions with the touch screen and stylus at their disposal (the game would probably display accompanying text that is the game's interpretation of what is being written...hey, they did that for Brain Age, but it was with numbers, right?)
What's the holdup, eh?