Google added a new report that breaks down your earnings on Google's certified ad network through DoubleClick Ad Exchange.
In the end, publishers just wanted more transparency and almost 20 months later, we have it.
Even more so, Google said they are "confident" that their "AdWords inventory can provide the highest paying ad." But advertisers are confident in Google, not the 3rd party payouts. The question Google is proving, is Google showing 3rd party ads when it is best for the advertiser.
That being said, you can look for yourself by going to the Performance reports tab and clicking on the ‘Ad networks’ in the side navigation.
Here is a screen shot of the report:
What have you learned from these reports?
Forum discussion at WebmasterWorld.