If they could make the DX lighter and more responsive, there would definitely be a market for it. I just got the Ipad and it is H-E-A-V-Y. I thought they would be good for seniors, but my mother wouldn't be able to hold it up.
The touch interface does make reading PDF's much, much easier though. And since I have access to millions of PDF's (I work in an academic Library) that's extremely handy for me.
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