If you haven’t noticed, perhaps because to my memory he has not explicitly stated it, Derek Sivers is writing a book about surviving in the music industry right in plain sight. Every post he’s made to his blog in the past several weeks is a chapter around this topic. I would not be surprised if he packages it up as a book at the end and sells it. I’m not a musician and I’d buy it just to support the idea.
I too have used this method. In fact, all but one of my books either started out as a blog post or are a collection of posts that are available for free, right now, on the web. Many of Seth Godin’s books fit this model too.
I not only have done this as a writer but I support it as a reader. I love the idea of being able to purchase a nicely curated and packaged collection of ideas. I don’t have to dig through a blog’s archive or skim through a category to get to the stuff I want. The author has done if for me and that is work worth paying for.