I'm tired, so I won't add any extra comments, but I think Tyler Cowen's attitude toward's blogging is spot on, and his analogy between good bloggers and DJs is really sharp.
Think of a blog as competing with both Google and Wikipedia, among other aggregators. If you knew you wanted to read about "the minimum wage," you could bypass Tyler and Alex and Google to the best entries (some of which might include us, of course). But with Google and Wikipedia you must choose the topic. A good blog writer can randomize the topic for you, much like a good DJ controls the sequence of the music. Sometimes you might trust us more than you trust other aggregators, but we can't count on that and arguably the other aggregators improve at a rate faster than we do.
I've voiced my frustration on aggregators several times. I think the best way to harvest interest insight from the internet is to just find a handful of intersting bloggers and let them spin their stuff. Trying to cull interesting posts from a long list of sites has proven to be tough.