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A good eBook Standard would help alot. The container alone is a major advantage over many separate files. Then you could probably do alot of the things in the mentioned standards with XHTML and CSS, but there is a bit more to it. Like how to seperate and mark chapters, subchapters, annotations, footnotes, etc. Nothing in the mentioned standards is a new invention, but its good to have it standardized, so you meet on a good basis. Additions should be allowed, but need a fallback solution. I would like to see a good ebook standard make its way to the publishers and into tha applications and finally to the paying customer.