The Intern posted today about stuff authors do to promote books that they haven't sold yet, like book trailers and so forth. She also mentioned blogs written from the POV of main characters.
As it happens, I've also recently heard mentions from other writers about character blogs. I thought about it today and tried to imagine how to handle one. Yes, no problem about writing blog posts from a character's POV, but what about content? Blogs give glimpses into the poster's life, so it would be great for worldbuilding, but what about story? If you try and keep the blog to events happening during the book, you risk spoilers (not to mention that you'd run out of blog fodder pretty quick).
A character blog might be a good thing for a writer to keep in between books, to sort of keep readers apprised of what the character's doing. But I can see problems with that too. Your book has to be set in a world that has blogs or you risk treating the character like an actor (which might be interesting, actually) reporting on his/her life in between gigs. And if your next book takes, say, a year to come out after the previous one and the main character's blogged all through that year, but your next book only takes place a few months (or weeks, or days) after the events in the previous book, that's not going to work very well. And how do you keep the interest factor high in the blog in between books? Basically you have to give the interstitial blog a story arc of its own that will resolve (or mostly resolve) just before the new book comes out, and you can't include anything that would mess up your book plots, and any pending story arcs from the previous book (like a romance or a mystery) have to hang fire for an unreasonably long time without being blogged about when that's precisely the kind of thing people blog about.
So anyway, it would be a lot of work. It might be rewarding, but it might not be. Your content would have to be stellar to keep reader interest--basically, you'd have to be writing another book in between books. You'd have to plan it carefully ahead of time or it just wouldn't work.
What do you think? Ever been tempted?