Currently when viewing a post, there is no indication that it's being used as a duplicate target.
As a curator, it's useful information to me that when I view a question, I am also informed if any other posts are linked to it as a duplicate. As such, I'd also want easy access to these posts.
As a reader and answer seeker, it is useful to see similar posts linked to it, especially if other answers were posted to the duplicates that contain something useful not in the duplicate target's answers (or they present the information in a different, and more useful, way). I _would_ argue that we have a problem if the reader needs to go seek these posts out, though, since it would mean we have failed to deliver the best Q/A possible.
On the question page itself, I'd like to see the number of posts closed as a duplicate of it. I also want to access the full list of duplicates. Either, there's a link to the search page (with search arguments filled out) somewhere on the Q/A page, or the list is shown somewhere on the page (in the sidebar, below the post, or elsewhere). If the list is long, only a subset of its content can be shown directly, though.
So, if posts B and C are closed as duplicates of A, I want to see on A's page, that B and C are closed as duplicates of it.
