as far as movie sounds and vocals id say thats the hardest kinda sample to get hold of on the internet, movie clips are easy enough to find but allways of a really poor quality and interesting vocal samples are few and far between also.

Best thing to do is sample from dvd, ive got a pretty big film collection so i tend to have a night in now and then just scanning through with soundforge at the ready if i fancy some spoken words or unusual sound..