When you think of Jeremy Piven, you think of an Emmy-winning actor, Ari Gold, and hair plugs. This fall, add Broadway star, as the Entourage misfit takes one of the leads in Speed-the-Plow, which returns to the Great White Way after a twenty year hiatus. Piven will play one of "two dueling movie producers," which means he'll have to stretch the capacity of his ego exactly one-half a centimeter.