I remember her for her Sin City role (Clueless was a bit far back for me to recall with clarity), but she the part she really stood out to me in was her role as a penguin in Happy Feet.
She had a lovely voice, and I adored her rendition of 'Somebody to Love' in that... it was a kind of similar experience to hearing Jane Horrocks sing in Little Voice - unexpected, and a very pleasant surprise.
Not sure what she was like as a person, and I can't say I was anticipating her next movie, let alone name it, but it's sad nonetheless.
She was however, 'living the dream', and making the most of her life before it was cut short, which is something to be grateful for (though I doubt that'll be of much comfort to her husband).