I have some japanese psp/pc games. Most of them are visual novels. It'd be great if i could take out dialogues in some normal format from them, but i can't. Do you know any program capable to do this? Especially these psp games, very valuable learning material I think.

I don't know about psp games, but it's fairly easy to record sound coming from your computer with something like Audacity.

I suggesting looking up "visual novel voice extraction" or "[game title] voice/audio extraction". I have no idea how easy/hard/possible this is, but if you don't like it I suggest ripping the audio from an anime episode instead. It's very easy, the audio is probably already mp3, 1 file - not 100 small ones, the voice acting is similar (or even the same), and you can get subtitles too.

Checked this "voice extraction" but no results. I was listening to anime some time ago but there is lot of spaces and music and I came up with this idea because VN always have tons of dialogues.
Thanks for ideas, i guess i'll just stick to the podcasts.

If you use subs2srs it will make an mp3 file for each line of dialog