Take a look at the screenwriting bundle, which uses Prince for PDF output.
http://ollieman.net/screenbundle
--oliver
In fact, it was your work that inspired me to take the next step. If it's okay with you, there are some automations in your ScreenMate piece that I would like to dissect and re-use/adapt for the kind of writing I do -- mostly essays. (I should note that I actually do do some screenwriting, but, since it's for a series of documentary shorts I'm doing with Louisiana Public Broadcasting, most of my screenwriting is in the field, on a notepad while we're driving or while the crew shifts gear around.)
On that note, let me say how thankful I am for your work on ScreenMate and James' work on the book and everyone else being so helpful on this list. I don't follow large chunks of the discussion, but I read it all in hopes of some form of intellectual osmosis happening.
john