Question of the day: Should I mention that I have a blog or am part of a network of blogs in my query letter to an agent?
My initial - and very strong - reaction to this question is a resounding NO. That is, unless your blog has a big enough following, like my pal Jen Lancaster's, to merit it, in which case, hell yeah. But the thing about blogging is that everyone can do it. In fact, nearly everyone IS doing it, so mentioning this doesn't mean squat to an agent. I'd go so far as to say that it might actually highlight your lack of other strong credits. I mean, if you've written for journals or magazines or won short story awards or what have you, then THAT's worth mentioning, and if the only thing you have TO mention is your blog, the agent might wonder why you don't have anything else.
(I'm not trying to suggest that you have to have other credits. You don't for fiction, but certainly, if you have them, highlight them. And highlighting your blog might instead draw attn to your lack of them.)
Now, if yours is the rare case of having a huge readership, then yeah. That's considered part of your platform, and by all means, mention it, mention your target audience, mention how it can help you land this book deal and how it will help you market the book. But in other situations? I'd leave it alone.
Anyone have other thoughts on the matter?