The only incorrect link in the blog appears to be the video link.
It should be
http://www.pgiconnect.com/api/community/messaging/blog/2009/07/01/video-maneuvering-the-api-community--pgiconnect
Actually, there are a few more broken links ... if the link is not found, the "api" directory appears to be missing after the domain name.
ie: all the links should begin with: http://www.pgiconnect.com/api/...