tedster - 6:19 pm on Jul 30, 2010 (gmt 0)
changing titles without changing content- particularly if you make incremental changes on the same page (as opposed to a single change from historic to final version)- that was positively dangerous
I'm happy you highlighted that one, Shaddows. Old skool SEO involved such regular, incremental title tweaks and it was a good way to probe the algorithm. No doubt that's the reason for this penalty. Title tweaking and internal anchor text tweaking are two very ticklish spots on Google's underbelly.