Top of the list: who do you figure the "Under Secretary of State" (p.4) was who seems to have worked closely with Libby in getting information on Wilson?

Hint: Look at the org chart at the State Department and whose purview the State Dept intel shop, INR, falls under.

Late Update: Just to clarify, I believe this detail and the person's name was identified in an article in the Post some time in the last few months.