DoubleClick,a global leader in digital marketing, advertising technology and services is being acquired by Google for a whooping $3.1 Billion in cash. The all-cash buy-out is about twice the amount Google spent to buy YouTube. Well, it is now pretty clear who will dominate the online advertising market. With this acquisition, Google have easily sidelined Yahoo and Microsoft. Google says that the acquisition is a big win for the publishers, as well as for advertisers and Internet users. Later in a conference, Google promises that user privacy will be handled as top priority among all the different integration challenges.