This book definitely contains a lot of useful tips. I especially like the bits about not being too specific in terms of your subject and not feeling as if you're confined to a single topic.
I do think that this book severely downplays the difficulty of marketing. I have a lot of blogging experience, and the absolute hardest part of a blog is not in the writing: it's getting people to read it. Social media is no quick fix. However, this book does contain useful tips on the writing part.
(review of free book)