This one has been bugging me too. There's simply too much noise and not enough signal in most of those sites. Feedhub looks like an RSS filtering/recommendation engine. I'm not sure if that's the same thing we're talking about.
I don't want to do it with RSS; I want a web site that organizes the information. I want the recommendation page of Reddit with a better algorithm and stories across digg, reddit and other social news sites. There is probably no reason to limit it to social news sites.
