The next big site could be www.dzone.com. They have a bunch of good stories, but unfortunately no community. Everything of interest there gets cross posted to programming.reddit and here, and I think they generally have it first.
i hit rawstory for political news, digg for general news (yea i know), and then YC for venture/tech news.
in fact, the main reason i like this so much is the discussion/comments. everyone is very mature, there aren't that many users, and people will generally give good advice/feedback (meaning they say it's good if it is and if it is not they say why).
I do have the feeling there is an angle I was missing though, and I'd be glad to be proved wrong!
I wonder if something like this could be built in a kinda of open source like way - make a wiki or something for ideas how to solve the problem, see if anyone wants to work on it, maybe use a pledge thing to raise money for servers when that starts to matter, that sort of thing... but that's another post.
I finally have time to do what I've always wanted: write the great American novel. Mine is about a futuristic amusement park where dinosaurs are brought to life through advanced cloning techniques. I call it "Billy and the Cloneasaurus"