Reading through Hugh McLeod's random notes on blogging, I realized he had both missed something and illustrated something at the same time. Blogging with humility *and* blogging with authority are not mutually exclusive.
Humility builds respect and adds to your authority, arrogance and snarky-ness take away from it.
Hugh's list reads very snarky to me. Almost snarky for snarky's sake. Good for building readership maybe, not so good for building authority IMO.
Doc Searls (and Jon Udell) on the other hand, are masters at blogging with authority sans arrogance.