There are a few good nuggets in this book but for the most part I was pretty disappointed.
If you already have a blog, then don't waste your money on this book. Find a book that actually gives specific advice on how to drive traffic to your blog, build content or use social networking. Most of the advice in this book was too generic and vague for anyone who has been blogging for more than 5 minutes.
There were 2 things that really irritated me about this book (fortunately they didn't show up until the end)
1. For as much as the author talks about her experience with blogging a book the reality is her book success did not come from her blog being discovered. She was already a published author with an agent to tap into. Grant it she does have useful experience on the process of blogging a book, but through out the book she talks (vaguely) about ways to drive traffic to your blog and get discovered when in truth that is not how it was for her.
2. She should have chosen better people for her success stories at the end. Don't get me wrong, I enjoyed reading success stories from real people whose blogs got discovered and turned into a book, but often her subjects would directly contradict things she said in the book. For example, she spends time harping on the importance of doing market research, but most of her success stories said they didn't do any market research; they simple wrote about a topic they loved.
The book isn't awful. I was able to glean a few useful nuggets. But as someone who already has a blog, I would have rather spent my money on a book that would give me specifics on how to make my blog more successful/attractive to make a book deal happen.