PSP Go?

Has the PSP Go already been hacked? If so, what are the UMD game files for it called? I believe they're called ISO's instead of ROM's, but I just want to be sure.And are there any tutorials for putting these games on there? If you could, please provide links. Thanks.
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Oh, and one more question. Would it be possible to somehow get PSN games to play on it? (like FFVII, and whatnot) Possibly the actual PSN files themselves? And where would I get these ISO's or whatever?Sorry for so many questions.

All PSP has been hacked, and that including GO.Backup/downloaded PSP games are usually in .ISO, or .CSO.