drall - 1:41 pm on May 13, 2008 (gmt 0)

Clearly this is a perm change in Google, we are seeing phrases we could have never dreamed of ranking for come out of the woodwork across our enterprise for months now while longstanding phrases are in chaos.

Age is one very big factor that seems to be coming into play for these phrases, even with little pagerank or IBL's to target pages which are ranking well.

We also noticed that the pages that are ranking well for these phrases are also the pages that are most popular with our user base but never linked to much nor have much internal pr.

This leads me to believe Google is now using to some degree some form of user behaviour tracking within the serps, probably something that was acquired from Doubleclick. Just my 2 cents.

[edited by: drall at 1:52 pm (utc) on May 13, 2008]