The article mentions the beginner's SEO guide, but coming in at 2 pages, the Web Developer's SEO Cheat Sheet from SEOmoz is my go-to resource:
http://www.seomoz.org/blog/the-web-developers-seo-cheat-shee...
http://www.seomoz.org/blog/the-web-developers-seo-cheat-shee...
Not that there is anything wrong with that.
meta!