These were originally created because of a contractual requirement 'to place a link to [About Chess] on Guide's existing site, if one exists'. It takes only a few minutes longer to place them on all pages rather than a single page, so that's what I originally did. The links produced a fair number of clicks into the site, consistently in the top-5 of external sites.
Removing the links was the first global change to the site since Round Trip Complete, when I added the links to this blog. While I was testing the change I was reminded that two other internal links in the header -- Highlights and Best games -- haven't been updated in years. Now that I have more free time, I should be able to tackle them in the coming months.
My page on 2004-05 Unification, which contains links to my material on About.com is going to be a problem. If I can't get permission to reuse the different posts, I'll have to come up with something else.