Do we care why Google bought DoubleClick? Well, it could be nice to know a little background history on the deal in progress.

Alex Kinnier, Google's Group Product Manager made a blog post yesterday as to why they decided to buy Doubleclick. Basically, DoubleClick has been a leader in the online advertising game from the beginning, helping advertisers get onto large sites such as AOL, Yahoo, MSN, CNET and ESPN.com.

Google's display advertising was seen as a little speck compared to the giants of online display advertising, AOL, Yahoo and MSN, and they wanted to change that. Google feels that DoubleClicks products and technology complement their own quite nicely, that paired with DoubleClicks delivery mechanisms can help current AdWords customers obtain more precise metrics enabling them to get a better idea how their advertising campaigns are fairing out. DoubleClicks superior knowledge in the industry will also be able to help Google's initiatives out by communicating with agencies and publishers to create more innovative ad serving technologies. Through the DoubleClick deal Google will also be able to help out with unsold media using DART, a hosted enterprise-class advertising management and serving solution for publishers.

So there you have it. It's all about helping the advertisers out. And maybe a little about lining Google's pockets with some extra R&D and Engineering dollars, judging from all of the new releases lately.