Another format. Yes. That will fix everything. ePub already supports XHTML and CSS. Extending it to support HTML5 is trivial if the renderer is using Webkit...

Another format. Yes. That will fix everything. ePub already supports XHTML and CSS. Extending it to support HTML5 is trivial if the renderer is using Webkit...which many eReaders do. And lets not forget the importance of content and form. Having a document that looks like a newspaper out of Harry Potter doesn't improve the quality of the message. They're different mediums and the message doesn't always improve with more distractions.