Thanks to a user calling him- or herself Obat with varying made up surnames, who has been spamming the comments fields of this blog with lamely disguised commercial messages during the last few weeks, I will for some time switch the comments-function to obligatory moderation. That is, if you post a comment, it won't appear until I give the go ahead - which I obviously will not if you display some sort of off-topic, commercial or otherwise inappropriate message, ditto link or somesuch. This goes for links embedded in usernames as well.
I regret to have to do this, preferring very much to make it easy for folks to post comments, when they have any. However, the Obats of this world make it necessary, at least for a while.