Panthro - 7:18 pm on Jun 25, 2012 (gmt 0)

but (as already mentioned above) many types of page are a success for the same analytics that make other types of page a failure.

Isn't this the key that doesn't come up enough in these analysis threads? Aren't these SE's of the future supposed to be learning how to classify documents? Maybe I'm wrong but I understand that to mean, at least partially, that an SE will learn to find out what category a particular document fits into and apply the rules of that category to how it is ranked, when and how it is displayed.

I think general rules for ranking apply across types of documents, but I believe the application of rules is more granular. E-commerce sites are treated differently than professional services, large forums from small government sites, etc, etc.