Draw up a list of the greatest living film makers and Werner Herzog would surely occupy a prominent place. He is reponsible for some of the most wildly beautiful images captured on film. If you've seen Fitzcarraldo you won't have forgotten the steamship being hauled over a mountain. He's seen as the film industry's obsessive genius; the director who once threatened to shoot his lead actor to prevent him quitting. After five decades making movies is Werner Herzog's love of film as intense as ever?