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For non-technical stuff, that is to say, for opinions, the peer review in the form of these letters is a great educumacational tool. I often nod along with a Salon article only to have the very different POVs from the letter-writers broaden my own view of things. The internet as a whole, with its spectrum of opinions, theoretically provides a vast informal peer review of practically everything. Whether the chaff will drown out the wheat is a bit of a worry... But twas ever thus...