Ask HN: How do you build a developer community?

On Monday I start a new job that involves building a developer community around a software product. (My employer makes a CMS-style platform. Developers create apps/modules that run on top of the platform.) I was hired in large part because I have built a healthy developer community around my open source project, the Nitrogen Web Framework for Erlang (http://nitrogenproject.com). Some lessons I've learned are: - Focus on providing organization and growing leaders, you can't do everything - Success is when a community starts answering its own questions - Help to publicize anybody who blogs or tweets about you. This leads to more blogs or tweets - If a picture is worth a thousand words, then a screencast is worth a thousand blog articles - If all else fails, go to your newsgroup and answer one question at a time Do you have experience in building tech communities? What lessons have you learned? Any good books or articles?