Just a quick explanation. My publishing system automatically creates threads in the forum for each story I've written. The problem is that I only added this functionality back in July, but I've got stories that go back for several years. When "Discuss this Story" is clicked for the first time it builds the thread in the forum, but when I added the technology, I didn't go back in time and do it for every story.
Instead, Google has been crawling through my site bit by bit and clicking the links for me. So every now and then it will find some new part of my website, and create the "Discuss this Story" links. Unfortunately, the date for the story is the current one, and not when the story was originally written. All the new stuff is properly dated, though.
Hope that clears it up. :-)