Thought I'd share a pretty cool website with you all: Wordplay.
It's basically a collection of articles on everything from creating meaningful story to what a real contract should look like and whether to write on spec.... all those questions that fuel the screenwriting seminar industry. It's definitely worth a peek.
I found Story Molecule pretty charming. The article follows how you initially shepherd a story idea into existence, but unlike most articles, keeps going as the story molecule runs into powerful people, feasibility, dumb ideas, money, and god knows what else. If you've reached the point of working with producers, you'll understand. If not, then prepare yourself.