Well pdf can be good..but it depends as to the application.
A friend of mine is a engineer and someone called to say would he like this item to be faxed...faxed! It was huge and could not be faxed (we're talking feet by feet here.
As a result he just had a pdf sent.
In terms of as a ebook I don't think pdf is a good format at all to use..epub is quite a bit better.
djvu is interesting as a open format but it's still rare. It seems to be to pdf's what ogg vorbis is to mp3's..
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