As heard 10 minutes ago on CNN.
Update: Of the three news alerts I receive, the Times was first, having sent its e-mail at 8:07 am. The Politico was second, at 8:47, and the Post was third, at 9:03.
Update (8/29/07): Looks like U.S. News was actually the first to break the story—last week. As its Washington Whispers blog reported last Friday night,
The buzz among top Bushies is that beleaguered Attorney General Alberto Gonzales finally plans to depart and will be replaced by Homeland Security Secretary Michael Chertoff.