"What's the point of these duplicate posts?"

As far as Eliezer's apparently redundant posts go: the QM indicies aren't exact duplicates of each other: they have different introductions, include or exclude some posts, have different posts bolded or not, &c. One reason for the multiple indicies seems to be to have somewhere to link to when making some seemingly percarious claim about QM elsewhere on the internet--cf. especially the intoduction to the "nonmysterious" index.

As far as the duplicate comments above go: it looks like Christopher double-posted by mistake, and Dmitriy is making a joke.