Attack of the BlogBots

Unfortunately, we seem to have come under attack by blogbots. The result has been lots of irrelevant comments hawking other peoples' web-sites added randomly to our posts. I have had to remove all such comments manually.
For the time being, I have changed the comment option on the blog to restrict comments only to registered blogspot users. Unfortunately, this will not allow anonymous comments to be posted directly.
I regret having to do this. I hope that the folks at blogspot will come up with a better solution soon.

Post Title → Attack of the BlogBots