Users can associate user stories with epics, and see these relationships, through the issue editing interface.

Per http://confluence.atlassian.com/display/GH/Working+with+Epics, I have to go through a convoluted process to see or edit the relationship between user stories and epics. This should be a first class UI feature, just like issue linking, so that it is manipulatable through the issue editing UI or viewable directly in the issue's page.