As far as I know, there's no to change contrast on any eInk display. I've looked reviews of the Kindle2 on Amazon and plenty of those complain about contrast also. My impression is that eInk just doesn't have the contrast of paper yet. That said, the touch-screen layer does decrease contrast a little. The contrast difference between the touch and non-touch Sonys was fairly subtle (under bright light).
* Screen Contrast On Sony:
In the NY Sony store they have bright lights pointing straight at the readers so they look their best. I had a paperback with me and tried shielding the screen from direct light and placing the book next to the reader. With my hand blocking the light I could read the book but not the reader. In some ways this isn't a fair test because it's unlikely you'll be reading in conditions where a 250W spot is pointing straight at you; furthermore, blocking the light in the way I did creates other contrast problems, such as large differences between the surroundings and screen. I couldn't test the Nook this way because the lighting in B&N was diffuse. In the end, I felt that the only way to test one was to buy it and see what it's like in practice. It's arriving tomorrow...
* Glare on the Sony:
I think the glare issue is one which will bother some but not others and I also think that it is possible to adapt to it completely: Frankly, I didn't notice any glare at all in the store. Any reflections off the screen didn't register with me either. Maybe I'm used to my laptop, which has a glossy screen. In fact, when I first got that the laptop the screen really bugged me. Two weeks later I completely stopped noticing the glare.
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