Lincoln:
A point I have noticed is that serials tend to attract comments for the first and last episodes, so maybe it is worth excluding those from this exercise. There are plenty of stories and snippets to go at!
What if you find a whole serial that's never been commented on? That's exactly what happened to me last night!
"Finding her Soul" By SpankerGuy.
Part one of that little serial would have made a perfect entry into our "Keyhole" challenge.
Edit: OK it seems that my memory was slightly inaccurate. The final episode has two comments from 2010. This serial still deserves more attention than it has received.