Former Editor-in-Chief of ClickZ Rebecca Lieb has published a book "The Truth About Search Engine Optimization" which I highly recommend for novice and intermediate search marketers.
In 51 short chapters of a few pages each she covers the basics and some more advanced information written in an easy to read format. It is now one of my recommended books.
Some of her insights we all should keep in mind:
"Searchers either find you, or they find your competitors."
"Search results are not something you can control. But if you are smart and you know what you are doing, you can wield plenty of influence over what shows up in them."
"Blogs are literally built to attract search engine spiders and crawlers."
"Don't live and die by Page Rank."