The SEO Cookbook at http://photographyspark.com... is a 60-page PDF that teaches photographers everything they need to know about search engines and how to rank well. It is broken into simple recipes, each taking 15 minutes to 4 hours. The recipes allow you to focus on a specific part of your website a little bit at a time. For example you can optimize your homepage one day, images another day, then a blog post, then get featured on another website.
It covers how Google works and how to exploit its ranking factors. It tells you step by step instructions for improving every page of your website so searchers can find you.