The project is no longer developed since 2008.
StoryBook may be open source, but it certainly isn't free anymore. I would call it Crippleware at best. If you want to do exotic things like Print, Save to another file format, or work offline you have to pay for the pro version.
Hopefully someone will fork StoryBook and turn it back into a useful application.
This is a really helpful tool. Easy to use, after getting used to it.
After installing and looking through the tutorials, I still can't figure out how to use this to actually write anything. Avoid it.
Our users have written 3 comments and reviews about Storybook, and it has gotten 26 likes