Final Draft is a robust program allowing for seamless collaboration.Montage is highly intuitive and great for keeping script elements organized.HollyWord is helpful when it comes to formatting, but that's about all.
Shoot the plan. We've all said those words. We set up our shot schedules, have our prop lists handy and make sure our talent is well briefed. But none of these tools - essential as they may be - has the visceral impact of a single storyboard panel.