SEO good articles

1) SEO & iFrame
http://www.straightupsearch.com/search-marketing/best-practices/seo_iframes_a_g/

2) SEO Glossary
http://www.organicseo.org/book/glossary
http://www.seobook.com/glossary/

3) hidden links
http://www.seozac.com/seo-tips/nontypical-links/

4) Organic book
http://www.organicseo.org/book/overview

5）SEO book

6)Forum
http://www.seobook.com/archives/000161.shtml