hi
here is the thing
Sophie has a server side component where users can download books from or upload their creations to.
It also handles comment and annotation sharing, stuff like that.
The server - just as the reader application - is open source, so one can run his own server.
I figure you can start with a Linux based Virtual Private Server - that cost about 30$ per month for hosting. (Of course if you grow it out you can always upgrade, that would be a sweet trouble to have...)
The question is, would it make business sense to start my own server? Is there sufficient interest in self-publishing and shared annotations?
What do you think?