Well, I read the Libby indictment. It says he lied about to the FBI and the grand jury about his conversations with Tim Russert, Matthew Cooper, and Judith Miller, when he told the FBI and the grand jury that he heard about Ms. Plame's undercover status from reporters. Instead, Libby heard about it from people in the Vice-President's office, where Libby was Chief of Staff. I suppose Cheney, Russert, Cooper, and Miller are necessary witnesses for the prosecution.
I'm guessing that the indictment does not live up to the advance hype - the Bush haters and muckrakers will be disappointed.