I use [url=http://www.blackobelisksoftware.com/]Liquid Story Binder[/url]. It's not exactly intuitive, but it's extremely powerful. Highlights are you can add chapters, notes, timelines, character profiles, pictures, music, and more to a single 'workspace,' call them up and manage them in a 'planner', assemble the chapters in a 'builder' and rearrange them at will.... it's cool stuff. But it is [i]hard as hell[/i] to figure it out.