I’m in the beta for StackOverflow.com, a site for programmers to ask and answer questions, with cool features like “reputation scores” and voting and badges. Now maybe it’s because it’s the beta and so it’s self-selected for people who are motivated to do things, but so far it’s already totally supplanted comp.lang.java.* as the place I want to ask or answer questions.
I’m hoping it will continue to be my favourite question and answer place when it’s overrun by spammers and “first post” losers.