My little movie cleaner now supports fan art. I still prefer it's use over other movie info tools out there. Movie Info Plus seems to load all the fanart into memory before asking you to select one. I'm not sure of the reasoning for that but mine uses the same source [thanks theMovieDB.org] but you just download the one you want. I'll have to tidy up the .nfo file bit now as that's looking like a proper cheap trick.
Anyway, to get my little movie cleaner click here