There's a bit of background information that might answer some of your questions.

The reason that the sequences written by Eliezer Yudkowsky don't feel like the product of a community blog is that they were originally written for Overcoming Bias which was an ordinary blog with a limited set of contributors and only later imported to LessWrong (which was created when those sequences were pretty much finished).

As far as I know, the story behind the sequences is that Eliezer Yudkowsky wanted to write a book about rationality. However, he had some trouble with it so he decided to first write out all the material in the form of blog posts of lower quality than a finished book would have. He is now working on that book and the last public statement about it that I'm aware of is somewhere in this interview.

Also, LessWrong has a wiki that's supposed to contain succint summaries of ideas presented in the articles but I don't know how complete it is.