Updated SEOmoz SEO Best Practices / Policies

SEOmoz has published some updated SEO best practices guidelines. The guidelines are apparently based on "correlation data", which means that they looked at rankings and analyzed the different components on the ranking pages.

The list of SEO best practice items gives recommendations for:

• Title Tag Format
• The Usefulness of H1 Tags
• The Usefulness of Nofollow
• The Usefulness of the Canonical Tag
• The Use of Alt text with Images
• The Use of the Meta Keywords tag
• The Use of Parameter Driven URLs
• The Usefulness of Footer Links
• The Use of Javascript and Flash on Websites
• The Use of 301 Redirects
• Blocking pages from Search Engines
• Google Search Wiki's Affect on Rankings
• The Affect of Negative Links from "Bad Link Neighborhoods"
• The Importance of Traffic on Rankings

This is great stuff, but as with everything in the "SEO" world, it needs to be taken with a pinch of salt. Each element that gets analyzed essentially introduces another unknown variable into a simultaneous equation.

One of the most interesting items is that H1 tags have been reduced to having nearly no importance in search engines. What I'm wondering is whether or not SEOmoz also looked at the CSS styling for the H1s to determine if H1s styled to a smaller font carry less weight, or if the reduced importance of the H1 is blanketed. We know that Google look CSS and JavaScript.