Here are a few blogs I visit every day, or The Something Interesting Criterion:
Kos is a Democratic Party activist. When I first started reading it the blog was more about ideas and fighting back against those crazy rightwingers. Now it's heavy on the party strategizing and presidential polls. Still, there's a lot of intelligence in it and Kos & his correspondences always say something, they don't just throw up a link and say, "Here's something interesting." The kind of thing that often isn't.
The Mighty Atrios
Atrios blogs lots. He's snarky without being bitter and the man adds value to his links. Yeah, once in a while he pulls the "something interesting" link bit, but not so often as to be annoying.
Thinks he knows what he's talking about. Does. Mostly.
Talking Points Memo
A real working journalist.
Tend to disagree with him half the time, but in an at-least-he's-speaking-intelligently-about-something-interesting sort of way. About poetry? Yeah, about poetry.