I have a different answer for #6, quite a lot. I used a PDA and Gen3, and now Gen3 and iPhone. And I don't replace Gen3 with iPhone, they're used at different situations. And I think they're biased to PC too. And I avoid PDF when I can. The same file doesn't look the same at my PC, my PDA, my Gen3 and my iPhone, my answer for #8 would be Mobipocket.
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