Search Engine Land is a must read hub for news and information about search engine marketing, optimization and how search engines such as Google, Yahoo, Microsoft Live.com and Ask.com work for searchers.
A well-rounded view on search engines and search engine marketing from five segments of the Web population represented by senior members of the major SEO/SEM forums on the Internet.
A leading SEO resource focused on helping successful webmasters make money and increase their profits through driving targeted traffic to their sites by improving their rankings in Google and other major search engines.
Search Engine Watch is the authoritative guide to search engine marketing (SEM) and search engine optimization (SEO), offering the latest news about search engines.
Matt's blog is a must-read for anyone wanting to understand how Google indexes and ranks sites. He provides a lot of insight into what the Google engineering team is doing to prevent spam sites from artificially boosting their rankings.