It's way too often that I'm frustrated by drilling down to s.campaign. Sure it's great that it's Fully Subrelated out of the box. But it uses the stupid Clickthroughs metric in order to define Visits! So if I want to drill down from a domain that sometimes has paid links, and sometimes does not have paid links to my site then I would go to the Referring Domains report, and drill down to s.campaign. Of course, I can't do this, because the Referring Domains report uses Instances, whereas s.campaign uses Clickthroughs. ARG!!