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Nook = Kindle2 = almost every other ereader with e-paper.
Every e-reader using e-paper right now uses the same Vizplex screen. The contrast is the same with exception of e-readers using non-wacom touch screens (like Sony PRS-600) which tend to have much worse contrast ratio.
Asus DR-900 will use Sipix e-paper which probably has... the same contrast ratio as Vizplex.
The only more contrasty device is Jetbook with reflective LCD (but the resolution is low and the screen is only 5'').
E Ink showed more contrasty (two times) Vizplex screens recently - but they will be available probably in 2011.
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