SEOmoz has released their best practices guide on SEO. This time, they used actual data to back up the best practices and have changed some of their previous best practices based on the data.

The post goes over the follow SEO elements:

Title Tag FormatThe Usefulness of H1 TagsThe Usefulness of NofollowThe Usefulness of the Canonical TagThe Use of Alt text with ImagesThe Use of the Meta Keywords tagThe Use of Parameter Driven URLsThe Usefulness of Footer LinksThe Use of Javascript and Flash on WebsitesThe Use of 301 RedirectsBlocking pages from Search EnginesGoogle Search Wiki’s Affect on RankingsThe Affect of Negative Links from “Bad Link Neighborhoods”The Importance of Traffic on Rankings

I tend to agree with most of what is laid out in the guide. But like all SEO guides, there is always room for debate.

Forum discussion at HighRankings Forums and Sphinn.