Howl's Moving Castle Resources
Incredibly detailed site including information on all of Jones's publications. This page also hosts a number of nonfiction essays by Jones, which are pretty delightful.
An obituary by Jones's super-awesome friend and admirer, Neil Gaiman.
This deeply thorough fan site includes a ton of bibliographic entries on books and articles about Jones's writing, as well as on Jones's own publications.
Definitely good for a laugh—the wiki writers over at TV Tropes have a great eye for clichés, of which Howl's Moving Castle certainly includes its fair share.
Another fan site, this time with neato flash animation.
Movie or TV Productions
Hayao Miyazaki's super popular anime retelling of Diana Wynne Jones's novel.
Two words: visually stunning.
The central motto on this poster is simply, "This castle moves." Yes. That's what the title tells us, also. Thanks, advertisers, for these insightful comments.
We want that cat.