I've just written a short book about blogging. I based the book on my own experience but compared that with 127 other bloggers. I researched the blog posts and comments left over a 5 month period. The results were amazing in that my blog has twice as many comments left as all of the other blogs I looked at. The book will be available very soon.
Recently I wrote a blog post called The Horse Whisperer (you can read it here)
http://mandyallen.com/the-horse-whisperer/ and was astounded...