Celtx - frescreenwriting, pre-production software for film, video, theatre, etc.

[mouser]

Celtx is Pre-Production software for film, video, theatre, and animation.

Write
Use the story development tools to create detailed backgrounds for scenes and characters. Write a properly formatted script that can be annotated with any type of media, including notes, photos, sound files, and video clips.

Plan
Generate descriptive breakdowns that can be shared with team members.

Organize
Keep track of all your project information, including any schedules in one place.

Collaborate
Collaborate with others using the built in project sharing features.

http://www.celtx.com/screens.html

from downloadsquad

[Carol Haynes]

Looks interesting - and its Open Source (which isn't immediate from the website until you get into the FAQs)