SEO: Search Engine Optimization

What are the benefits of ensuring that HTML code validations, as per the specification, and does invalid HTML code prevent SEO rankings?
Slides for the 2007 Webmaster Jam Session SEO conference.
Vital academic and research papers for SEO
Protecting your content from bad robots and scrapers is important for SEO. Here's some thoughts.
IMPORTANT: This is an OLD Search Engine Optimization FAQ. Much of it applies today still, but some information may be invalid. Provided for archival reasons only.
How do we redirect domains with no WWW to domains with a WWW. This can be useful for "Link Equity Consolidation" in SEO.
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