Is somebody randomly advertising roofing services on my blog?
The third comment here under "What is a Graintable," ostensibly by "henry" leads to such roofing services.
Maybe it is just someone playing around, but I wouldn't be surprised if exploitation of the MovableType interface is going to lead to all sorts of advertising in this manner.
P.S.; I live in a brownstone, we do not need any roofing tiles! Thank you!
Update: I am now using a Bayesian spam filter for comments, so beat that with a stick!