I'm with Atrios on this one. What, exactly, is supposed to be the outrage? I would assume that the whole point of his using a pseudonym was so that he could maintain some segregation between his comings and goings and those of "Atrios"; once Duncan Black began to take more of an open role with the other blog, he "outed" himself. I don't see that as being ethically comparable to a blogger secretly being on the payroll of a political campaign, although even that isn't really a big deal, either.