I DO care about ePUB and PDB (not about DRM, I'm not likely to buy any DRMed ebook any time soon), but I also want folder support, and better dictionary lookup, and configurable margins and spacing, and adjustable gamma/brightness[*], etc.
[*] For images. Even if the 4 gray levels are always the same absolute levels, the mapping between the image colours and the screen grays could be changed.
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