Google is messing the search results once again.
In my opinion they have big trouble because all this "link and
PR" stuff, because they had pushed for years that people go out to get backlinks, and
now they can't trust in links anymore.
In fact, many authority sites uses nofollow tag for naturall links to avoid loosing
PR!!
So, everything is going crazy and Google is trying to find a way in this mess.
The only option will be "content". Google will have to forget about
PR, links, etc. and concentrate in content.