Official blog post with a 5 page FAQ:
<a href="http://googleblog.blogspot.com/2007/04/next-step-in-google-advertising.html">http://googleblog.blogspot.com/2007/04/next-step-in-google-advertising.html</a>
$3.1B in <i>cash</i>. That's pretty sick.<p>I'm guessing Doubleclick is basically going to stay independent (especially since they don't have any stake in Google). There's probably substantial culture mismatch, in which case integration of the company would be tricky.