Ask HN: Best Book On Search Engine Optimization?

The SEO landscape does change quickly, but books are a good way to understand the theory in a nice "from the beginning" way (blogs are sort of hard for this). Rand Fishkin heads up SEOmoz.org and co-wrote the "Art of SEO" book so you won't go wrong using both resources. Even after a few years of learning SEO, I still found some value in reading the book. SEO's one of those things that it sounds simple and makes sense when you first read it, but it takes a bit of repetition and application before the nuances start to stick.