Google buys DoubleClick. And is now the most powerful behavioral marketer on the planet.

The acquisition of DoubleClick by Google is not surprising from a business standpoint — they now have a big footprint in the third party ad network space. And I think it makes sense.

But wow. It boggles the mind as to how much consumer data that Google now has available to it.

Think about it. Information on searches, email usage, download habits, video viewing and all the rest, with the information from DoubleClick’s massive datastream of information from cookies and sites.