It appears that there is a new open source eBook format being worked on, by the name of WebBook.
Here's the announcement. The WebBook website itself
can be found here.
From what I can gather,
Daniel Glazman is a former Mozilla engineer and JavaScript programmer, and programmer of the
BlueGriffon EPUB editor, that has become fed up with EPUB and wants to create a new, more open eBook format that more closely resembles a website in design.
Anyone know any more about it? Thoughts?