callivert - 2:32 am on Aug 9, 2007 (gmt 0)
So, I learned four things from this.
First, Google have a spam detector, independent of SERPS algos. Yes, old news but this cements it as fact. Plus, Google actually call it their "spam classifier";
second, the detector has pretty aggressive settings. they don't mind a high number of false positives;
third, blogs are probably at higher risk of being flagged as spam.
Fourth, the importance of this classifier has recently increased.