I have watched the SEO craze hit and evolve over the few years it has been around. It seems like everyday there is something new brewing in the SEO community. No site should be without optimized pages or content as well as off page factors like links or PPC.
I often read posts over at
SEOmoz, founded by RandFish. He has created a great article and write-up on SEO for beginner's.
Beginner's Guide to Search Engine Optimization (SEO)
forumowner - if you are looking for something to read more about SEO then I recommend that article along with another article on search engine ranking factors.
Search Engine Ranking Factors
They really give insight to users who do not have much SEO experience and are looking to gain more knowledge about the subject.