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MtGox was (past tense is probably appropriate here, but for the sake of anybody who had coins there, I hope not) a startup that failed spectacularly, and publicly, and took a TON of peoples' money with it.
The transaction malleability thing was poor programming on the part of gox. Remember that we have ALL fucked up at some point, just luckily for most of us, "fucking up" doesn't mean losing than much of other peoples' money.
Mark, I doubt you read hacker news, but if you do: it's alright, dude. You bastard.