The Skyforge, behind the Companion's base, seems a bit special. The Companions speak of it as if it had some magical powers, and built their base there because of it.
My question is: does the Skyforge grant any bonus to Smithing quality when you craft weapons or armor on it? For example, would a 100 AR Daedric Armor on a normal forge be a (for example) 110 AR piece when smithed on the Skyforge?