Google AdWords is testing a new feature named "campaign groups." Campaign groups let you set and track goals across multiple campaigns to track their impact on a shared or "common goal."
Ariana Wolf first shared this finding on Twitter and shared these screen shots showing off the feature. You may be able to access it yourself under the "all campaigns," "all drafts," etc menu on the left hand side.
Here is the overview screen:
Then you can set up the campaign group using this configuration screen:
And then you get these analytics from it:
Pretty neat, don't you think?
Forum discussion at Twitter.