I just saw Howl's Moving Castle a couple of weeks ago!
I've gotta say, though I didn't think it was bad, it wasn't my favorite of Miyazaki's films. I still have a bunch of them to see, but my ranking so far is:
Princess Mononoke (definitely in my top 5 movies)
Spirited Away
Ponyo
Howl's Moving Castle
There just didn't seem to be enough... something... in Howl's Moving Castle. I'm not quite sure I can pinpoint what it was.
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"Filthy lawbreaker, unhand that vending machine!" - Casey Jones