Interesting blog post. I didn't realize StackExchange tries to stifle discussion. I'll have to look it over. This is what we're trying to do here at Hawkee except with an emphasis on sharing code within the discussion.
I poked around a bit and it is pretty nice. I like the modern icons and buttons, but I feel the design is a little too busy. I noticed they used hearts for likes. I'm still considering doing that here on Hawkee.
and for a demo: http://try.discourse.org/