Jon Ericson makes an interesting point in his recent answer (well, really, just reiterates the same point he's been making for weeks, albeit not an insubstantial one): In order to become a successful site, we need to have a solid reason why asking your Vim questions on vi.SE is considerably better than asking them on Stack Overflow. Specifically:
I'm left wondering who is served by this site who would not be served by leaving Vi[m] questions where they are now.
Perhaps a bit severe, but again, it is an argument: If we want a real community, we need to be able to draw in users who don't classify themselves as programmers. Otherwise, why not just ask on Stack Overflow?
This might be more of a question for when we reach public beta, but it doesn't hurt to ask now. Even this early in the site's development, a whopping 31 out of 36 of our top users have Stack Overflow as one of their top 5 network accounts. How do we plan to attract users who aren't using Vim for programming?