Not that I much care, but pdf does offer one benefit that is apparently scarce - the ability to time limit a book, so that they can be borrowed from ebook libraries. I believe the only other format which does this is mobipocket. To me, that's a pretty big plus. At the same time, since I can't read them on my cybook, it's useless to me. That doesn't mean it's useless to everyone though.
Oh, and to Jon: Mobipocket creator gives an option for high compression, which creates even smaller file sizes. Of course this only matters when you're making your own books.
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