I've just returned from Aberdeen, where I was being interviewed for a job at the university (fingers crossed). In my limited experience of these things, it's always a bit nerve-wracking, and you can never quite predict what questions you'll be asked (although there are some that always come up: where do you see yourself in five years?). One of the five-member panel asked me if, apart from the research-related stuff on my CV, there were any other skills or things that I would like the panel to know about. I was unprepared for that, and I figured that saying 'no' would sound like 'no, I have nothing of interest to say about myself whatsoever', and couldn't be a good thing. Although I hadn't planned to, I talked a little bit about this blog, and explained how I used it to try and explain scientific issues in an accessible way. To my surprise, it went down very well with the panel, and I was asked how my blogging experience might help in university teaching. Given my relative lack of teaching experience, having the opportunity to talk about that can't have done my chances any harm.
So, if you're a blogger doing interviews, it's probably worth bringing up your blog. After all, you use it to distill complex issues down to their essentials, don't you? That's definitely a transferable skill.