It is huge. Where others are buying $5,000 booths at
conferences and spending $500 a day on AdWords my marketing spend is
next to nothing because I get many sales from people talking about me.
Plus blogging got me media exposure which makes it easier to get more
media exposure down the road. I was a no name SEO with one popular
article before I started SEO Book, but now I have thousands of
subscribers and thousands of customers. The single most important part
of my business right now is blogging.