Comments and spam

I'm happy to see first comments coming to my blog. Unfortunately, some of them are strange. Their structure is some like "Your blog is great, I also write about X,Y,Z". I think the sole purpose of these comments is to create links to their blogs and thus to raise their page rank (authors of these types of comments typically have also a blog on SEO).
If there is no other content than the above mentioned, I won't publish them, since they are more spam than anything else. Other comments are more then welcomed.