Comic writer and friend Ian Ascher introduced me to a free word processing program that I almost immediately fell in love with. It's called Celtx and is available
here. This program is set up specifically for writers writing screenplays, stage plays, audio and even storyboards because it allows you to format your scripts on the fly to the standards of each different type of production. I'm using the Film format and adapting it to use in comic script writing. So far it's perfect for it, and it has the perfect price to boot-- $0.00.