There have been a couple of system specific threads, but instead of having all these different topics I think it would be good to have a single thread were you can tell if you know any video games(on any console, handheld, or pc) that have an option to play in Japanese.

I know 2 so far, one is
Yoshi's Story-Nintendo 64 and the other is Jax and daxter2 for the Playstation 2

For ps3 I know ninja gaiden sigma 1 and 2 have both full english/japanese text and audio for both languages. Star ocean the last hope(just bought it). has full japanese text/audio.

For Iphone/Ipod users some good games you can play in Japanese that I can think of off the top of my head are:

Chaos Rings
War of Eustrath
Final Fantasy 1
Final Fantasy 2
Secret of Mana
Infinity Blade
DoDonpachi Resurrection
Espgaluda 2