I've noticed that many of the meta-posts here are premised on the belief that being interested in rationality (or being interesting in identifying oneself with a community of "rationalists") is strongly correlated with actually being more rational. I wouldn't be surprised if this were indeed the case, as compared to average; however, I'd be very hesitant to simply assume that people here are "atypically rational" as compared to, say, another Internet community comprising similarly high-IQ individuals, but with no special interest in rationality per se.