I think only you can really choose which sorts of posts to put in, Suw. I mean, if they still feel relevant & interesting to you then there's probably a good case to be made for including them. You wouldn't be just stringing a bunch of blog posts together & calling that a chapter, I assume - there'd be some commentary in there as well, yeah? If you don't feel inspired to write about it again, then leave it out. I agree you can't stick to a single subject, and you shouldn't try. Part of what make your blog so fun is the fact you flit about from subject to subject. You're more than clever enough to put them together in a way that would be highly readable in a bookish format, I'm sure. *cough* I mean, your hypothetical blogger is...