What does this mean? It means that every single site we looked at which got negatively hit by the Penguin Update had a “money keyword” as its anchor text for over 60% of its incoming links. On the other hand, the sites that were not hit by the update had much more random percentages. Having over 60% of your anchor text being a money keyword did not guarantee that your site would be hit by the penalty (many of the sites not affected had numbers just as bad), but if under 50% of your anchor text for incoming links were “money keywords” it’s all but guaranteed you weren’t affected by this update.
key points re penguin - http://iPerpetualTraveler.com