In my opinion this book is a must for small entrepreneurs that create their own site and wish it to be a notch better than most sites. It provides a great knowledge base on how to write for the web and how to keep visitors to your site from wondering away.
The book is a slow read. I found myself going back and forth reading again previous paragraphs. There is a lot to remember and to learn.
Although the book deals primarily on the Call-To-Action (getting your clients to buy), writing copy for your site is a process rather than an action.
The book make sure you understand that so don't get discourage and keep tweaking it all the time.