I love Celtx.. 
Makes my life so much easier.

Makes my life so much easier.
Our whole production company uses Celtx, often at the same time... work that out.
PaulGriffith - that looks interesting. Is it only online interface though? Can you download an internet independed software?
Me likes it. I have yet to try this, but apparently you can feed premiere (CS5) the script form story and it'll analyze the audio and show you on the timeline where each word is said. Makes cutting super easy.