Diana Wynne Jones has passed away after a long battle with cancer. She is not as well known in the United States as she should be. According to the authoritative Encyclopedia of Science Fiction she was "probably the premier UK writer of children's fantasy in the late twentieth century." She wrote exceptional books for teens and adults, and children's books for children of all ages. Her novel Howl's Moving Castle (1986) was made into an animated movie in 2004 directed by Hayao Miyazaki.
Cheryl Morgan has provided an interesting list of links to Diana Wynne Jones remembrances. The most informational of these links is the one to the Encyclopedia of Science Fiction, which does a good job of putting Jones's work in context and perspective. It ends with a thorough list of her work.
Chris Moriarty: 10 Things I Learned from Diana Wynne Jones