It would be nice if you could set an "A" point (the first word of the first chapter) and a "B" point (the last word of the last chapter) and the eReader could dynamically calculate your position in the book as a percentage. With enough decimal points to give precision down to, say, a 200 word section of the book.
It seems like this would work fairly well across editions and different font size and margin settings settings. The printed book people would not fit in however. But they have no standards anyway, so they don't even fit in with each other.
A percentage number, with adequate precision, might even kind of work a little to go from an eBook to an audiobook. Counting words/percentages in an eBook is not going to directly match to counting bytes/percentages in an audio file, but things might average out better than one would think. Enough to be useful to some degree at least.
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