Maybe this’ll get reopened if I add to it.
I am interested in importing my Vox blog into WordPress, too. For lack of a better option, I’ve copied and pasted some of the entries over and edited the timestamp accordingly. However, WordPress doesn’t seem to note them as being posted on the date assigned; they aren’t reflected that way in the calendar widget at all.
Any other options here? It’s bad enough to lose comments, but to lose sequence, too is much worse.