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(Note from MBlume: though my name is at the top of this page, the wording in various parts of the welcome message owes a debt to other LWers who've helped me considerably in working the kinks out)
I found OB through Marginal Revolution, which then led to LW. A few here know me from my previous job as a professional Magic: The Gathering player and writer and full member of the Competitive Conspiracy. That job highly rewarded the rationality I already had and encouraged its development, as does my current one which unfortunately I can't say much about here but which gives me more than enough practical reward to keep me coming back even if I wasn't fascinated anyway. I'm still trying to figure out what my top level posts are going to be about when I get that far.
While I have told my Magic origin story I don't have one for rationality or atheism; I can't remember ever being any other way and I don't think anyone needs my libertarian one. If anything it took me time to realize that most people didn't work that way, and how to handle that, which is something I'm still working on and the part of OB/LW I think I've gained the most from.