Feathering the light that comes from your softbox is a very important tool/technique and as photographers we need to know how to do it.
So here are a few articles that will show you how:
From Strobist - Feathering a softbox
A PDF - Feathering is ticklish business
Amherst Media - Feathering
Digital Artform - Feathered light from a grid (be warned this article has some mannequin nudity)
;)
