deadsea - 12:23 pm on Jun 12, 2012 (gmt 0)
Internal anchor text diversity does not hurt me currently. I few years ago, Google was often ranking the wrong page for queries. The search terms would all be on the page that was ranking, but there would be a better page much more suited for the query. At the time, I fixed the problem by interlinking all my pages with anchor text of all the search phrases that Google was pointing to the wrong pages. pointing to the page I would prefer to rank for that phrase. At the time, it worked like a charm. Google looked at the internal anchor text coming into the page, and payed a lot of attention to it. Some of my pages have as many as 30 different related phrases linking to them internally.
I'm not sure this is helping at all today, but the site wasn't penguinized or pandalized either.