Look at this Hilary Mason post for example. Hilary is a big tech brain at Bitly, the URL shortening service. I think this woman has data for breakfast while the rest of us are still asleep. And she is a permanent fixture on the speaking circuit of the NY tech ecosystem. You go to some random event and there she is on a panel.
Did I Get An Email From Hilary Mason?
The discussion she has started has generated some intelligent comments. It is a robust discussion. This is not exactly Fred Wilson's comments section, but it is pretty good.