Mindy's brand new CIA video, Awesome Strength, uses a medicine ball. It's a good workout, but definitely not a structured workout - it looks like chaos, because you have 3 people with totally different equipment doing similar exercises. Mindy uses a BOSU and medicine ball, another girl uses a step and dumbells, and the third girl uses tubing most of the time. They all switch between medicine balls and stability balls. It offers a lot of variety if you want to use different equipment when you work out. It also seems like a great workout to take on the road, because you could follow the girl with the tubing (and I think the only other thing she uses is a medicine ball).
Laura