MoffettRules: Not so much a script idea, but as far as writing scripts go, check out Celt X
. It's an open-source script-writing program that I used in some college classes I took (including a theater class) and it will make it very easy to do professional scripts.
Note: They just changed their web site, and in order to go anywhere you have to initially create a free user account with them. I just had to do it myself so I could check the link above, and also update to the latest version on my Mac. They make versions for Mac OS X, Windows, and Linux. They have product images showing iPads, so I'm guessing maybe they also distribute through Apple's App Store. Anyhow, just thought I'd add this.
Now, as regarding writing scripts, it sounds like a fun project. Nobody in the entertainment industry will take it seriously even for a split-second, but it would be a great project to work on. And, it would let us get our passions, our frustrations, our day vexations out and perhaps produce a thing of brilliance.