I appear to have got onto the radar of the comment spammers. They are subtle; the first one said that they had added my site to their RSS feed, the next one complimented me on my site name. Both of them, if you follow up the back references, go either nowhere or to a dummy site.
To spammers: I moderate the comments here and for good reason. I also look to see who you are before I allow your comment to see the light of day. So bugger off.