As a web developer, I love this book. I wouldn't have believed it possible to cram so much useful information into 180-ish pages but the author does an amazing job. I approached the book having built many rather boring-looking sites and always knew they weren't quite right but couldn't put my finger on it - this book put that right.
The book is basically a step-by-step guide to designing websites that meet the needs and expectations of today's surfer - rather than the surfers of the '90s (which my sites were guilty of). Just take a look at the Contents page. The author walks you through the "Usage Lifecycle" - users start off unaware of your site, then they become interested, then they're first-time users, then regular users and finally they become passionate users - and shows you, step-by-step, how to design for each phase. The author tells you the "best practice" for each stage, what works, what will make users abandon a stage (and how to design to avoid this), what will kill your site.
I have one observation - the final chapter, "Funnel Analysis" is pretty boring - not at all like the rest of the book - but this is probably my own natural aversion to anything involving testing, statistics or anything analytical!
If you are a web developer I recommend you get this book to ensure you are building professional sites that work. If you're thinking of getting someone else to build you a site, you also need to get this book to make sure the developer is designing to best principles and that there is an excellent reason behind every design choice you make.
My only criticism of the book? I wish the author would stop telling my competitors these secrets ;)