A few times in the post, Justin mentions broken links. You should have a link checker (I use GSite Crawler) of some kind and verify that your site’s links are functioning. Bad URLs can lead to bad rankings nearly immediately. I had an experience once where a directory page with relative URLs kept looping back to itself for about 30 of the on-page links. Yahoo! all but disappeared from my site until I got those links fixed.
Justin also refers to another article of his that seems promising, given the info that he extracts for this article, but gives no link or location as to where this ‘other’ article is found. Awww, pooh!