Ditto for the comic book reader. Something like Manga Storm on iOS.
Utility app with different tools like a calculator
Free augmented reality game (could be another Welcome Park camera minigame, but using the AR cards)
those would be great. i like Crackle, they have some great movies for free, and they always have Seinfeld.
and i love the Vita's AR capability. the free AR games and that free Resistance AR app were really neat.
PSN: ScreamAimFire999 [PS4, PS3, PS Vita Owner]