That was relatively fast. Being new to blogging, I was also surprised how spam posts look like. They might not have any “spam” information. Rather, some of them are just a very generic sentence thought could fit most posts in the world. I guess they are used as some sort of “tagging” mechanism to google for blogs that allowed such a comment, for later spamming.
Interestingly, one of the best signs of a spam post seems to be that they enter the URL of a search engine into the “URL” field. That’s probably a good tell-tale sign I’ll look out for, because I can’t imagine there would be a lot of “real” commenters that would do something like that, seeing how they could just leave that field empty instead of entering bogus information.