It's really problematic to not be able to see relationships at the same time as comments/emails/activity (especially custom relationships, I'm not talking about links and dependencies).
I regularly reference relationship information in my comments and emails, so, I'd love for the custom relationships section to be included in the main area, along with checklists and subtasks, etc. Having to click around to switch between the two, and not be able to type comments/emails while looking at the relationship fields is a real pain.
I believe that's already planned, from what I've heard, but I wanted to get this out there and make sure.
Of course, if/when this feature is added, that will make relationship custom fields and rollups visible as well (though, I know there's a different canny post about that already).
Thanks!
Edit: having them show up in a persistent left hand side bar, in a list underneath the subtasks, would also work.