Well, I've had a hard time really figuring out what to believe, but it looks like a certainty that Rice was either caught in a deliberate lie, or gross incompetence, or both.
White House docs were just released after apparently being delayed for political reasons, but they now show that plans relating to counter-terrorism were turned over to her, despite a written statement to that effect.
Far as I can tell, the story was broken first, and in greatest depth, by citizen journalists in Korea, at ohmynews.com
One possibility raised by these facts is that Ms. Rice was unaware of the FAA warnings when she appeared before the press and testified before the 9/11 Commission. This would raise serious questions about her preparation and competency. Another possibility is that Ms. Rice knew about the FAA warnings but provided misleading information to the public and the Commission. Neither of these possibilities would reflect well on Ms. Rice. Perhaps there are other more innocent explanations for these seeming inconsistencies.
In contrast, the White House is evading questions on this subject.