Games for long trips

So to get to Germany next week i'll be getting a train, and then a plane. So i'll need something to occupy my time with. I'll be bringing my 3DS, DS and PSP so if any of you know any great games i could bring with me then please let me know. I'm already thinking of replaying The World Ends With You, but i haven't touched my DS in ages so haven't got any up to date games on there.

Sony

Got to say that Sony sure did do a good show, by far the best presented and also a good range of games. The new PSP Vita looks brilliant, and only $299, guess they've finally learnt their lesson and lowered prices!
I'm not sure what was up with that DJ at the end, i really doubt anyone that would go to E3 would be into that. Anyway tomorrow is Nintendo, can't wait to hear about the Wii 2. It's going to be great, but i'm not sure whether they can top Sony. They were very impressive.