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Touch screens are not necessarily 100% good news. We know, for example, from the example of the Sony PRS-700 that - on that machine at least - adding a touch screen has significantly degraded the clarity of the display, and that there's also an issue with dust getting between the layers of the screen. Another factor to consider is that some type of touch screen (eg that used on the iPod Touch) have a reflective surface, and that can make the screen difficult to see in some lighting conditions, as well as showing up fingerprints.
I'm personally going to wait and see, and reserve judgement on whether or not adding a touch screen is an improvement.
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