I'd just pelt him with smart remarks. Things like, "Thank you for breaking my $130 piece of electronic equipment" (never mention that it's a gaming device, most people use that against you, as if video games are evil or something), and being very short with him from now on, If I'd bother to talk to him at all. In fact, don't talk to him at all unless it's to throw a smart remark at him about it.
If he tries to be nice about....anything....like say....he says something like, "Hey! Let's all go out for ice-cream, I'm buying.", I'd say, "Just give me the money so I could put it towards getting my $130 electronic device fixed."
Don't just let it slide, keep throwing it in his face. Don't let him live it down. He says, "I didn't break it", you say, "Well, it didn't break by itself, and it worked before I left for school (or wherever you went). The only thing that changed is how YOU threw it in a corner and now it's broke. Seems to me like you broke it."
Just be relentless about it. The $130 should be the operative word in almost all your remarks. When he gets angry (and he will, that's what you are trying to achieve after all), you could say, "Well, there is an easy way to avoid all this anger, you know. You're not the only one who's angry." and then look at him accusingly.
I'd just be a real dick about it until you get a new DS. Guilt can go a long way.