[Dysiode]

Fantastic! I actually made something with the same exact intent (except that it was more geared toward sharing your ideas with friends) but not being a writer myself it never really made it that far usability wise (although, it did have a name generator ;).

I watched the screencast and it looks actually useful! However, navigation looked a little clumsy, and having signed up and played around some, that's proven to be true. For example, in the chapter list there's no direct way to get back to the book except via the book menu. Also in navigation: having to click "Show" is unintuitive to me. I naturally want to click anywhere in the row.

As for features: I wish it were possible to interlink the various bits of the book together with each other. For example, going back to your screencast, being able to go beyond just saying "This is Sherlock's house." and linking Sherlock and the setting together. Perhaps more useful would be tying everything together in chapters (Sherlock and Watson and Arbitrary Character do something at Sherlock's house in chapter 3!).

Those are my main thoughts. I'll have my 5 users check it out and see what they have to say about it since they've actually used my site fairly extensively (over 200 characters amongst them). They're used to everything being public (I know how terrible that is, but they like reading each other's stuff), but they should still have some decent feedback :)