My guess is that Miller Gossiped, i.e. the leak went Judith Miller (NYT) -> Administration -> Cooper (Time) and Novak (WaPo).
Whether there is any evidence that Plame’s name went twice around the merry-go-round (Administration -> Miller) is another matter.
Whatever the scenario, what amazes me is that few people seem to question that this was a vindictive act rather than a cockup.