Google Search Engine Optimization Starter Guide
Back in November 2008, Google published a 22-page PDF guide to SEO. The company has just updated that to provide some new features and content. You can download the new 32-page PDF guide over here.
In particular, Google added a glossary of definitions and terms, additional example images to support the content in the guide, mobile devices optimization techniques and clearer wording for better readability. Google has also translated the SEO starter guide in over 40 languages.
In addition, they have finally revealed the true identity of GoogleBot.