Like everyone else, I don't like seeing the same thing I've already seen on the frontpage. DuggTrends posted an article on dupes and got me thinking about how to combat them.
My idea involves somewhat combining stories that deal with the same topic. Take the "Plane Crashed into an NYC Residential Building" that DuggTrends points out. Most of the stories come from different sources technically making them original stories. The only problem is that they are duplicate information. Why not allow people to add alternate sources to already submitted stories? Perhaps it could look something like this?
The result would be similar to Google News, which lists all the related links to the same story. When new information comes out regarding the story, a new story submission is warranted. Using the example above, the new story would have been "Pilot of NYC Plane Crash was Yankees Pitcher Cory Lidle".
I guess it all comes down to people wanting to get front page stories rather than trying to contribute to whatever social news community they prefer.
Edit: After some good feedback, I thought I would add to the idea by having a similar feature to comments whereby users can vote the sources up and down. Like so: