[mkhaytman]

That, and Google have been introducing more services into the results page (flight shopping comparison, for example).

You can see an article by Danny Sullivan from this summer here: http://searchengineland.com/google-results-too-ad-heavy-1662...

And this is great breakdown of the various types of results Google is providing these days: http://moz.com/blog/mega-serp-a-visual-guide-to-google