Actually, this is one site I'd really rather you didn't visit. It's a software program that will help you write a screenplay with the obligatory 'Michael Bay Explosion' and the 'Euro Car Chase.'
Yes, as if Hollywood wasn't already brim-full with formulaic scripts, "Plot Builder is the simple solution to visualize and develop your story in correct industry standard format."
How d'you write a great screenplay? As William Goldman (Butch Cassidy, etc.) replied, "You just put a piece of paper into the typewriter and write FADE IN."