This book is a great source if you are planning to do search engine optimization in-house and by yourself. It will teach you the most important things about SEO in a fast paced format to help you take your website to the top on Google. This book will guide you about the key components of SEO without doing deep on each topic.
The only thing I missed in this book is the lack of mention of SEO communities, forums and organizations like SEOMoz, Search Engine Land and SEMPO, to keep readers updated on this fast changing field. I wish the author had expanded little more on link building, as it has become the most crucial factor in attaining rankings after you are done with your on-page optimization.
Don't Make Me Think by Steve Krug and Prioritizing Web Usability by Jakob Nielsen are two great books on web usability. I own both, and without hesitation I would recommend them if you wish to improve your websites for your visitors.
If your are directly involved with designing websites, usability, or analytics, I would recommend Jakob's book to you. However, if you are an online marketer or a businessman in a hurry wanting to learn important aspects of usability, to see how it could effect your website, its appeal and ROI, Steve's book is a short, sweet and informative asset to your business.