No comment
Matt Gemmell’s conclusion regarding the comments on/comments off debate isn’t surprising: where you stand is (or should be) informed by the purpose of your blog.
As far as Backstrip goes, this is my publicly-shared commonplace book. I want to move you as fast as possible to the destination, whether that’s a point I’m trying to make or a link somewhere else. Comments would only add friction and distraction to that process - for me and you.
If I wanted to develop ideas, solicit (and collate) feedback, and/or cultivate a community, and if I was prepared to take on the burden of moderating, filtering and responding, then I’d switch them on. But that’s a lot of ifs.
In other words: comments may or may not add value, but they always have a cost.