I decided to take a look at Oliver Taylor’s screenbundle TextMate bundle for writing screenplays in TextMate. On the left is what you write, and on the right is a preview of what you’ll get as an output. If you download a little add-on, it’ll even export straight to PDF. Celtx has to send your screenplay to a server to convert it to a PDF. Which means you need an internet connection. Which sucks.
My Verdict: screenbundle works pretty well. I had to get a little fiddly with tabs and stuff, but once I spent a minute figuring out how to do things properly, I was able to get some stuff done.
My Other Verdict: I have forgotten almost everything I learnt in screenwriting class.