Yes. Your blog is being felt out. I was getting this same junk for a while. I think they do it to every blog (automated of course) and then search for the random junk to compile a list of vulnerable blogs that they sucesfully commented.
I was fairly active in deleting those random things as they came.. but just today I got whacked with a massive attack of them – this time they contained real links and keywords and such to adult oriented sites.
My solution so far has been to get rid of trackbacks all together for the time being.
