Wow, that was fun… Having removed a plugin that automatically hyperlinked site names in posts, I noticed that a lot of old posts no longer had the site’s linked to properly. Of those that did, some where missing the http section of the URL, so the links actually led to www.chrismerriman.com/sitename , which obviously caused issues.
Manually editing some 120 posts later, I have corrected all the links to my niche article sites. I still need to go back and check all the posts in the Personal, Kazakhstan and Kazakhstan-related categories, but I’m stopping for now.