Coding Communities - What Works?

drDugan asks: "There is a resurgence in interest lately in information-based systems and websites for data sharing, structured data, and enabling communities to work together better. I'm working a contract for a new business that is trying to build a community to support people who write software. What communities are you a part of now that help you write and develop software? I mean this question in a general way, including both online communities and offline interactions (your office, LUGs, etc.) -- where do you find connection with other people to get information, answers, and inspiration?"