First, as an aside, this is my first meta question: if this would be better suited for a different meta, or is an inappropriate use, please let me know.
I am a regular user of Stack Overflow, and an active participant on Programmers.SE. One thing I'm noticing is that there are a lot of repeat questions, particularly on Programmers. There are also starting to be a bunch of "almost but not quite duplicate" questions.
I think that it might be worthwhile to have a repository for similar questions that can be pointed to in a new question. Sometimes "closed as duplicate of..." isn't really enough, but it is annoying to cut and paste an answer from one question to another. Conversely, it's a little annoying to when asking a question to see the same answer a number of times when you are looking for something slightly different.
It may be nice, then, to have a place to create a page that has links to similar questions, and be able to reference that in the new question.
Edit: Additional Info
I believe that a user would need a certain level of reputation to create and/or to add a link to such a page. Perhaps it could even lead to a new badge or two.