George R. in the forum had an interesting idea to catch spam: check how many results a phrase search for whatever the commenter posted are found in Google. If something yields a lot of hits in Google's index, then it's likely to be pasted in many places, thus - so the idea at least - spam. (For instance, a lot of spam is phrased in the unspecific style of "Interesting blog, thank you, I will look for more on this topic"... unfortunately,