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I use Calibre to convert downloaded Library ebooks to a format for my wife's kindle, and also for my android tablet (Aldiko). I have just converted a pdf to 'mobi' format with this. It does it but not that well, which is a shame as it is difficult to read two-column pages on an e-reader. What about the effect here of the fact that many times while we are reading we are not connected to the Internet? What I hate is that I need that intermediary bit of software from a specialist supplier (Adobe) in order to download library e-books, as the actual file seems to come from a central resource, not the library.