I don’t understand the spammers. Why would they spam me and include a URL for Google? This is what I just found (and what Akismet missed, unfortunately):

HI! I’ve have similar topic at my blog! Please check it..

there was no other URL in the whole spam comment. I don’t assume that Google would comment spam blogs (if they need a higher pagerank, well, they’d know what to do), so who did this and why? Can anyone enlighten me?