Meh, It's OK. I can already order from my seats at Phone Company Park in San Francisco, just not as 'leet-wise as with a DS.
Remember the old game they used to pass out at A's games? Anyone? The one where you tried to predict how each batter would do, and you'd get points the closer you got? That'd be a cool app to implement on a DS. With the wi-fi, you could even do a ladder for all players at the game, and maybe give away a prize to whomever gets the most points. I'd be stealing my daughter's DS for every game if that was available.