If Libby mentioned Plame during the July 8 meeting -- and Miller's responses to the documentary subpoena suggest she has notes from that conversation (see 8/27/04 Aff. at 19-20) -- then Libby's version of events would be demonstrably false, since the conversation occurred before he spoke to Russert.
And this, from the indictment ...
17. On or about the morning of July 8, 2003, LIBBY met with New York Times reporter Judith Miller. When the conversation turned to the subject of Joseph Wilson, LIBBY asked that the information LIBBY provided on the topic of Wilson be attributed to a "former Hill staffer" rather than to a "senior administration official," as had been the understanding with respect to other information that LIBBY provided to Miller during this meeting. LIBBY thereafter discussed with Miller Wilson's trip and criticized the CIA reporting concerning Wilson's trip. During this discussion, LIBBY advised Miller of his belief that Wilson's wife worked for the CIA.
If any part of Fitz's trial case is going to rely on Miller's testimony, he is going to have a problem. Per Miller's article on her testimony regarding July 8 meeting, she says in part:
"Mr. Fitzgerald asked me about another entry in my notebook, where I had written the words "Valerie Flame," clearly a reference to Ms. Plame. Mr. Fitzgerald wanted to know whether the entry was based on my conversations with Mr. Libby. I said I didn't think so. I said I believed the information came from another source, whom I could not recall.
Mr. Fitzgerald asked if I could recall discussing the Wilson-Plame connection with other sources. I said I had, though I could not recall any by name or when those conversations occurred."
http://www.nytimes.com/2005/10/16/national/16miller.html?pagewanted=4&ei=5070&en=cf212f513f3b582e&ex=1139115600
And here is another article by a prior colleague of hers describing her notetaking and memory skills:
"... "For some reason none of us had a tape recorder, so on the flight back to Casablanca we compared our notes from the one interview we’d had with a Moroccan general a few hours before. We wanted to be sure the phrases we’d scribbled down were accurate. But there was a problem. Judy had many more quotes in her notebook than I and another reporter had in ours. And Judy’s were much better. Then I realized why. I’d done a lot more homework on that particular story than she did, and I was asking much more detailed questions. She’d written them down, and now she thought they came from the General, but many of the quotes actually were from … me." ..."
http://www.freerepublic.com/focus/f-news/1504961/posts
I think the defense team would have an easy time portraying her as not having the greatest memory and not a reliable witness.