[Natsu]

Very possible. I gave more mention of that possibility in the writeup.

There are some weird things, too. I see what might be links between mystery numbers in the spam pages and parts of their URL, and I find it odd that they're the only site listed in those error messages, and there aren't a lot of those errors. Which may indicate that they're not deliberately blocking the spambots. But I will concede that it's weak evidence so far at best.

On another note, who is using your blog as feedstock? Can you give a URL to a spun copy of your stuff?