SEO made easy by Brad Callen

Good list of SEO tools by Aaron Wall (www.seobook.com)

SEO basics by David Burdon

e-book packed with insight, tips, and techniques on keyword research that you can apply easily to your own website from Wordtracker

Viral Copy: Trading Words for Traffic by Brian Clark

How to Use the Modern Press Release by David Meerman Scott

A thorough e-Book on keyword research, taking you from gathering to sorting to organizing keywords from Pole position marketing

This guide provides a complete overview of many of the processes, techniques and strategies used by professional search engine optimization specialists from seomoz.org