Spotted at The American Street:
It looks like http://www.discourse.net has been hijacked. I wonder if Michael knows.
Now, I doubt that Kevin is playing a prank here, so presumably he's really seen something. But I have no idea what it is, my site looks normal from here, and thus I have no idea what the problem might be (cache poisoning somewhere? a 302 exploit? ) or what I can do about it.
Update: Kevin amended his post, and we exchanged emails. For the reason described in the comments, the problem is solved (Kevin seemed to have inherited a spammer's IP number, which I had redirected).