Miranda Otto (Dark Horizons): An article about Miranda Otto and her role in The Lord of the Rings
Miranda Otto: Eowyn (Empire Magazine): A short interview with Miranda Otto about LOTR.
Female characters are scant but strong in Tolkien trilogy (Orlando Sentinel): A lovely article about the woman of LOTR. Interviews with Miranda Otto and Liv Tyler.
Emerging Éowyn: Heavy Burdens and Slashing Swords (LordoftheRings.net): An interview with Miranda Otto from the Official LOTR website.
Warrior Princess (Starlog): An interview with Miranda Otto in which she discusses the character of Éowyn, Éowyn's relationships, and her fellow actor, Viggo Mortensen.
There and Back Again (Ain't It Cool News): An account of the author's visit to the set of ROTK. This includes a lovely description of Éowyn and Farmir's wedding (which I've bolded in the article).