07/16: David Corn article (first reference to Plame's "covert" status
Corn is important because back in Febriary he had asked Wilson to write an article for the Nation. They had lunch back then and Corn was particularly interested in Wilson's "establishment" credentials. Given how long it takes to right an article of any length and with any research one must assume that the piece was in process 7 to 10 days ahead of time.
6 May 2003; after meeting Wilson on a "panel", Nicolas Kristof of the NYTimes authors the first article on Wilson's trip to Niger without disclosing Wilson's name.
12 June 2003; Walter Pinkus of the Washington Post writes about Wilson trip to Niger. It is later disclosed that Wilson leaked the story to Pinkus.