Great article, Brian. Like that you’re finally talking about Domain Authority (DA). It’s essential to make skyscraper technique work as well. Also, a great pointer on comments as I have personally seen articles perform well because of comments. Do you recommend closing the comments as well a few days after the article is published? Kinda like Copyblogger does now.
Meta tags. Meta tags still play a vital role in SEO. If you type any keyword into a search engine, you’ll see how that keyword is reflected in the title for that page. Google looks at your page title as a signal of relevance for that keyword. The same holds true for the description of that page. (Don't worry about the keyword title tag -- Google has publicly said that it doesn't pay attention to that tag, since it has been abused by webmasters and all those trying to rank for certain keywords.)
In addition to optimizing these six areas of your site, analyze your competitors and see what they are doing in terms of on-page optimization, off-page optimization (competitive link analysis) and social media. While you may be doing a lot of the same things they are, it’s incredibly important to think outside the box to get a leg up over the competition.
Early versions of search algorithms relied on webmaster-provided information such as the keyword meta tag or index files in engines like ALIWEB. Meta tags provide a guide to each page's content. Using metadata to index pages was found to be less than reliable, however, because the webmaster's choice of keywords in the meta tag could potentially be an inaccurate representation of the site's actual content. Inaccurate, incomplete, and inconsistent data in meta tags could and did cause pages to rank for irrelevant searches.[dubious – discuss] Web content providers also manipulated some attributes within the HTML source of a page in an attempt to rank well in search engines. By 1997, search engine designers recognized that webmasters were making efforts to rank well in their search engine, and that some webmasters were even manipulating their rankings in search results by stuffing pages with excessive or irrelevant keywords. Early search engines, such as Altavista and Infoseek, adjusted their algorithms to prevent webmasters from manipulating rankings.