Yarnos,
Good idea!* I will finally get to use the neat lighting diagram found here on PhotoCamel (I don't remember what forum though!)* The lighting set up you see below is what I use about 95% of the time.* There are a couple of differences between the diagram and my "real life" camera room however.* My hair light is on a track on the ceiling not on a boom and I don't use pole to hold up my seamless paper.* The hair light and background light readings are for a dark background and a subject with dark hair.* If the subject has blonde hair it will be less and If I want a darker background it will be less.* I ALWAYS use ISO 100 in my camera room and in my outdoor studio.
Benji
(Added in edit) Here are the distances FROM THE SUBJECT of the various lights in the diagram for the head and shoulders image. I place the fill light on the same side as the main (as shown above) and about 8 to 10 feet from the subject (behind me.) The center of the light is about seven feet up from the floor which means the bottom of the 62 inch umbrella is about five feet above the floor. It is feathered (as shown above) off to one side. NEVER aim the fill or main directly at the subject, use the "sweet spot" that surrounds the "hot spot" which is found directly in the middle of the light source. The MAIN light is usually about 30 inches from the subject (it may be as close as 24 inches or as far away as 36 inches, it depends on the pose and the subject.) It is also feathered so the hot spot winds up in front of the subject by about 12 inches as shown in the diagram. The bottom of the 24 x 36 inch softbox which is my main light is usually slightly about eye level to the subject and the whole softbox is tipped down at a 45 degree angle. The background light is aimed directly at the background light so it puts a halo of light on the background behind the subjects back and shoulders and is metered to be about the same power as what the main and fill meter together (and what is the aperture of the lens is.) The hair light is above and behind the subject and is usually about 18 inches away from the head and is metered so it is the same power as the main and fill combo. The kicker light is about 3 to 4 feet from the subject and is metered like the hair and background light. I have posted an image showing this set up. I learned this lighting set up from master photographer Frank Cricchio. This should give you repeatable images day in and day out. Someone on another site said this will give you "predictable" results as if that were something bad. Personally I prefer predictable results to reshoots!!!
Benji