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I'm not sure why I didn't bring it to your attention earlier, since I've read it three times already, but you absolutely should take a look at this GQ oral history on the making of Goodfellas. Oral histories can sometimes be pretty lazy or boring (and they're ripe for parody), but this is a terrific example of the form.
Have that issue but haven't gotten around to reading that yet, I was a bit put off by their claim that it's a better movie than The Godfather.
In that case, there's a great in-their-own-words making-of history of The Godfather that you'll enjoy.
When I was six, Home Alone was my Goodfellas. Now Goodfellas is my Home Alone.
I love this shit!