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I say no because it is preformatted for a specific page size. True e-book formats need to be size-independent.
The funny thing about PDF, if I understand its origins correctly, is how it is an electronic repackaging of an physical printed page (in Postscript language). Talk about your circular work-arounds! Take one electronic file, send to imaginary printer, and capture that back to an electronic file (imaged for that imaginary printer).
I see it as analogous to my print-ready digital images. The universal electronic format is the RAW file. By the time it is ready to print I have done all sorts of things that narrow its focus toward a specific printer and print -- crop, DPI resizing (sometimes with interpolation), contrast adjustment, color gamut compression, and even specific sharpening for the print resolution and intended paper type. So that print-ready file is NOT a "general image file" any more. In the same sense, how can PDF be considered a general e-book format?
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