I've in the past modified Dano's script which pulls data from IMDB (for movies), to include much more tags, including the "producers" property of the iTunMovi XML which is used by Apple devices.
Producers are unfortunately not mentioned on the "main" imdb page of the movie, and one has to go to the "combined" page of the IMDB result to get the "full" data.
I will post my updated script shortly back into Dano's IMDB post.