Planet Ocean was the first SEO website I started reading, they have been around since 1997.  They are famous for their book “UnFair Advantage in Winning The Search Engine Wars!” but also have the Search Engine News website as part of Planet Ocean Communications.

Search Engine Roundtable‘s stated mission is to provide a single source for the reader to visit to locate the most interesting threads covered at the SEM forums.

WordPress SEO, from SEOmoz is a great way to learn the differences between static pages and dynamic pages on WordPress websites.  The page explains the differences for those that are new to WordPress in an entertaining way.

Search Engine Journal (SEJ) was launched in 2003, and offers a community-based approach to search marketing. Their content comes from “real experts”, in-house and independent Internet marketers themselves.