Can't recommend it highly enough. Gorgeous, well-acted (Johnny Depp especially), and nicely written to boot. The animation is tastefully used, not to mention beautiful, and the plot is just minimal enough not to crowd the movie. My only complaint is the absence of White Rabbit in the soundtrack, which seems obvious to me, although admittedly, the movie doesn't suffer much without it.
Go ask Alice, I think she'll know...
Trouble in mind, lord I'm blue
But I won't be blue always
The sun's gonna shine in my door,
Shine in my back door someday