Thanks to the global illumination, a path-tracer like Cycles doesn't necessarily need big lighting setups; in fact, in the recipes we made, we only used one single Spot lamp in addition to the IBL and the results have been quite good anyway.
In Blender Internal, instead, a minimum arrangement of lamps must be done to obtain satisfying results, even with the aid of the World settings we have previously seen.
In this recipe, we are therefore going to see a classic movie three-point lighting rig, an industry standard. The effect of the main key light is enhanced by the other two lamps: the fill light, to brighten (and color) the shadow areas on the subject, and the backlight, to create a light rim on the subject edges thus making it stand out against the background.