I download a program called Scrivener. Its pretty cool, it even allows me to save all the old versions when I make changes.
Media stuff has a fixed format, so there’s specialized software for it, but I found that I had to split the formatting part from the creating part. So I used to lock myself up in a motel room and just write for a few days using either pad and pen or whatever my current word processor was. Later I’d go home and plug it into the screenplay software. Everybody’s process is different, the best process is the one that works for you.
Scrivener looks pretty cool. I like that their focus is on getting you through the first draft.
I have bookmarked it.
Can you take several versions of a work in progress and paste them in, easily?