I started to ask "What's this not-a-panel panel in Unity, and how do I control it?" but I've at least gotten as far as realizing it is the "global menu".
My global menu has a message notifier widget in place that scans my email, empathy, pidgin, etc. for new messages. I'd like to ...
Remove Evolution from the menu (It shows me both Evolution and Thunderbird even though I don't have any email addresses set up on Evolution).
Tell it to use Pidgin or Empathy -- for some reason it is currently showing me both.
I'm frustrated that right-click doesn't give me any additional options here. I can't even figure out how to quit Pidgin, since it is only in my message indicator, not in my launcher.