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Ah, ok -- great ideas :-)
It is indeed possible to write to the eink just as easily, so a tree navigation using a combination of the eink + lcd is quite feasible. A more "faceted" browsing system (ie, by tags/author/etc) over a database of books, using the Calibre or other index would indeed be very useful. It'll be interesting to see the evolution of library managers for the Nook; and there are some efforts being hatched at nookdevs at least...
The trook local book browsing is quite basic, but FWIW, to the extent someone can organize N books into a multi-level hierarchy with k folders or books at any level, it approaches your last idea. On the LCD, one just sees the current k choices (be it a sub-folder, or a book.) Tapping a sub-folder icon drills into the next k choices, while tapping a book opens it; and it takes roughly log_k(N) swipe/tap gestures to get to any book...
-kb
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