3 links
Chrestomanci Castle, or Travels in the Land of Ingary
suberic.net
Site dedicated to Diana Wynne Jones. Structured like the moving castle, it has discussion archives, a bibliography, news, letters from the author, links and a wiki.
The Many Worlds of Diana Wynne Jones
dianawynnejones.com
Flash site from Harper Collins, detailing her books, book series, and information about the author.