StackExchange is so nice, I don't even mind spelling its name with CamelCaps. It has specialized niches like Reddit, an expert community like Quora has in its better moments, and a genuinely effective user-moderated reply system. The best part is finding new subforums: I just found one for German language questions and one for sound design. Whenever I find forums like these on Reddit, they're usually ghost towns or full of users with far more questions than answers.