Still, the site format is optimized for really narrow verticals. I think they're going to have trouble overcoming the fact that the best example of their knowledge engine's success is really inaccessible to the average user. I'm guessing even a lot of IT guys would have trouble understanding/demonstrating how useful StackExchange might be for a topic completely unrelated to code.
edit: I do think the technology is very interesting, just that non-technical people will have trouble seeing that.
I wish I could think of some cool topics to make one for.
Non-technical people pretty much just have moms4mom.com to look at right now.
Or maybe the answers become public to non-members after so many months? Does it have that feature?
Right now, there is no such exclusivity, nor would I really want it, personally. I would, however, want to recruit moderators from HN, especially those with higher karma.
* StackOverflow (or StackExchange precisely) is actually built so that trolls and their friends are limited in what they can do anyway