Cos you're gonna need it! There are so many tips & tricks in this book, you'll want to keep notes as you can't help but brainstorm ways to implement them into your own site.
I thought this would just be another one of those common sense website design books, but this is top shelf stuff!! With every chapter I thought to myself, "I can't believe they're giving this all away".
Absolutely love it. You'd be stupid not to buy it at this price.