After the initial idea (below) I started thinking of additional features, like having another search criteria to get "the other side" or more than two sides of a story, and you can search for these sides on the same topic of, say, "Obama".
Also I was thinking of a "media skew" chart that shows how well the actual news stories that are being published are/are not aligning with the preferences of the users of the nightingale news site.
Also they can vote on news outlets and filter according to that as well, and the votes could be revealed publicly, so people actually know where most others are getting their news, or like getting news.
The thing I am most concerned with developing first is the search algorithm. It could just use google, but use the extra flags as simple filters on the search. I am interested to hear what ideas other people have on this.