I hope I don't convey any selfish motivations for posting this topic. Honestly, I'm trying to find a venue for me to discuss my interests.
One of the dimensions of my work I want to expand is my mastery over specific subject matter. It's tough to find a colloquial yet masterful community forum for discussing new ideas, and especially so when I'm not sure which area I want to specialize in for my career.
I like HN because it's simple and isn't overwhelming.