We've burned all existing copies of it. Days and days are spent outlining, ordering scenes, re-ordering, and throwing entire plotlines out. The actual writing of the script is the fun part. That's when you get to sit back and let the characters run. In all seriousness, it's a great way to create because you have instant and honest feedback.
Writing individually is much scarier.
You're alone with your computer all day. Plus, it's really cool to never, ever have to go into a job interview or meeting alone. Since we've started working together, there just hasn't been the time or energy to write alone. Also, I don't want to. I'm never going to be as good a writer alone than I am with Aaron.