And Debunking Urban SEO Myths!

Speaking of debunking urban myths, how about those of the SEO world? I just posted about a list of things that may (or may not) influence how a page will rank in search engines. But what convinces people of the truth behind a particular factor? Cause and Effect - Not Always Easy to Determine from Scottie Claiborne over at Search Engine Guide looks at how you can end up assuming something is working a certain way for all the wrong reasons, plus gives some basic tips on how to test correctly.