After recommendations from a couple of readers, I checked out Millions a couple of weeks ago. The film was directed by Danny Boyle, who did Trainspotting and 28 Days Later, and is a children's film. You might think this odd, but as Ebert notes,
...[the filmmakers'] delight in the film is so manifest. But they are serious filmmakers who do not know how to talk down to an audience, and although "Millions" uses special effects and materializing saints, it's a film about real ideas, real issues and real kids. It's not sanitized brainless eye candy. Like all great family movies, it plays equally well for adults -- maybe better, since we know how unusual it is.
Reminds me a bit of Brad Bird's The Iron Giant. Both are kids movies that most parents didn't take their kids to, but really should have because they have a substance and soul that most other kids movies lack. And they're perfectly good films for adults as well. But relatively few saw either of them[1], which is a shame.
[1] The unremarkable Brewster's Millions made more at the US box office than both Millions and The Iron Giant combined.