I've been following this story, but haven't had time to post on it. NRO writer Ed Whelan has been widely criticized by bloggers left and right for outing a former practicing attorney and legal scholar who writes under the pseudonym Publius.
Today, Ed Brayton has a nice summary and some highlights. After initially defending his actions, Whelan apologized last night. He elaborates on his apology here. It seems genuine and Publius has accepted it.