Anyone else thing that this would be a useful feature?
Currently, when I look at a question, I use the script that can be found in the accepted answer here to do that. It works pretty well as a rule.
While I understand the comments to that question and answer in that many people will not be using this feature in the general population, the people that are using the review pane are not really the "general population." It would be a shame to review all of these questions, and then try to look for duplicates separately.
I would like the following idea to accomplish this (though I am more than open to other ways of doing it):
Show a short list of possibilities (assuming this option is enabled) with the questions that the system thinks are related. It would be nice if it uses something more than the question title, but I understand if that is hard to implement. Additionally it would be nice if the view was expandable to show some of the text of the question, but this could easily lead to clutter (though having an option to close/minimize this could be a solution to this issue).