An interesting development: Isao Takahata's 1988 heart-wrenching masterwork, Grave of the Fireflies, is now available for digigal download on Apple iTunes. No doubt anime fans and publishers will be watching closely to see if this movie succeeds on this format.
Disney does not hold the US distribution rights to Fireflies, so I wouldn't expect or anticipate more Studio Ghibli releases on iTunes in the immediate future. But it would be a pleasant surprise. Stay tuned, kids.