An interesting article on photo.net from a gent who believes in very large modifiers, such as a 6x6' back-lit diffuser, for model photography.
http://photo.net/learn/lighting/going-big/
I posted this because it was new to me and it happens to agree with some of my more recent mumblings in this very forum. If it's old stuff to anyone, I apologize for wasting your time.
Cheers,