Despite Yudkowsky's obvious leanings, the Sequences are not about FAI, nor [etc]...they are first and foremost about how to not end up an idiot. They are about how to not become immune to criticism, they are about Human's Guide to Words, they are about System 1 and System 2.

I've always had the impression that Eliezer intended them to lead a person from zero to FAI. So I'm not sure you're correct here.

...but that being said, the big Less Wrong takeaways for me were all from Politics is the Mind-Killer and the Human's Guide to Words -- in that those are the ones that have actually changed my behavior and thought processes in everyday life. They've changed the way I think to such an extent that I actually find it difficult to have substantive discussions with people who don't (for example) distinguish between truth and tribal identifiers, distinguish between politics and policy, avoid arguments over definitions, and invoke ADBOC when necessary. Being able to have discussions without running over such roadblocks is a large part of why I'm still here, even though my favorite posters all seem to have moved on. Threads like this one basically don't happen anywhere else that I'm aware of.

Someone recently had a blog post summarizing the most useful bits of LW's lore, but I can't for the life of me find the link right now.