Blogging and writing are like peanut butter and chocolate. (Mmmm. Reese's.) Since I can't add the pieces to this blog as I'd like, I'll refer you to someone who knows lots of things about blogging and writing: Jane Friedman -writing, reading, and publishing in the digital age.
Spend some time on her blog and you'll see why blogging and writing are two great tastes that taste great together.