In the shade of a sprawling pine tree, on the banks of a gurgling creek, a young man chats animatedly with a bearded fellow more than twice his age. Between them lies a thick stack of papers and a row of gnawed No. 2 pencils. What looks like a scene from a movie may actually be the formative stages of a feature film. It's a typical day for the fellows and creative advisors participating in Sundance Institute's Screenwriters Lab, a five-day workshop that gives independent screenwriters the opp...