What are some methods employed by hackers to find the text strings for newer games (Wii, DS, PSP, etc...)

I know it's quite easy to do with classic games such as NES, SNES, Genesis and so forth as you just need to look at a PPU viewer or it's equivalent and hover over the sprite sheets. For more recent games, what goes into finding text such as Japanese characters for the English patches I see released from time to time? I'd like to get into that type of English patching but don't know where to start.

I look forward to any responses!

Well, not all games uses it. But there is something else that is different these days. There are filesystems. The very existence of a name on things can help a lot in finding things.