Edited to add: in the original post, I intended but forgot to emphasize that I think the correlation between IQ and rationality is weak at best. Do people disagree? Does anyone want to go out on a limb and say, "They aren't the same thing, but the correlation is still very strong?"

I'll go ahead and disagree with this. Sure, there's a lot of smart people who aren't rational, but then I would say that rationality is less common than intelligence. On the other hand, all the rational people I've met are very smart. So it seems really high intelligence is a necessary but not a sufficient condition. Or as Draco Malfoy would put it: "Not all Slytherins are Dark Wizards, but all Dark Wizards are from Slytherin."

I largely agree with the rest of your post Chris (upvoted), though I'm not convinced that the self-congratulatory part is Less Wrong's biggest problem. Really, it seems to me that a lot of people on Less Wrong just don't get rationality. They go through all the motions and use all of the jargon, but don't actually pay attention to the evidence. I frequently find myself wanting to yell "stop coming up with clever arguments and pay attention to reality!" at the screen. A large part of me worries that rationality really can't be taught; that if you can't figure out the stuff on Less Wrong by yourself, there's no point in reading about it. Or, maybe there's a selection effect and people who post more comments tend to be less rational than those who lurk?