For our throws workouts recently, my little group has added a variety of Hooverball with a light medicine ball. What a great conditioner for throwers. It goes fast, you throw a lot, and you start to notice your heart and lungs. The next day, we have all reported soreness throughout the upper body.
We have also added an idea from a buddy in Highland Games which might be worth an addition for some crossfitters: Jeff Armstrong gave me four foot piece of PVC with a "T" glued to the end. We slide a 25 pound plate down to the "T" and do multiple swings around the head, hammer throw style. This seems to work the upper body in a way that can only be felt, not described.
Just an idea.