I think it would be useful for questions to have links to any meta-discussions about them. This is inspired by The Oracle, which posts new meta questions to Chat.
Could the site automatically post a comment like "This item has been referenced in [this meta question]" to any questions or answers so referenced?
Additional options around user experience include a default-on check box for posting this message, and including the original question title on the link.
An alternative proposed by @nitsua60 is to allow Linked questions to work between main and meta, rather than just within their own sites. This creates an automatic, bidirectional connection between two questions by creating links in the Linked section of the sidebar.
Another alternative, inspired by my own misinterpretation of nitsua's idea, is to have another section to the sidebar specifically for out of site references. For both this idea and his, I think I prefer my original suggestion because it gives the ability to refer to specific answers as well as specific questions. I am open to changing my mind on this.