I don't know when it will be finished. It is what you might call a sandbox of experiments to see what features are supported on what platforms. Updated cover.
Seems like the presentation I gave at the London Book Fair was very popular! Well, the turn out was very good, with people unable to get in for lack of seats. So, here then I post up my presentation slides in PDF), in case anyone missed it.
This talk was given as one of the seminars organised by the Publishing Training Centre, where I run the Creating eBooks 2-day course.