I am a huge fan of Ridley Scott's ( director of alien, bladerunner...) storytelling and cinematography and one day would love to see an exhibition of his storyboard work. The approach to storyboarding for life action can be somewhat different to animation. Even though with the increase of vfx shots in big budget movies the two areas seem to be getting much closer. Essentially though storyboarding is the first visual representation of the film. Ridley Scott brings this to the point in this short video:
The art of storyboarding with Ridley Scott