KEEP the keyboard! AND the wireless / 3G.
Cross-document search of pdfs. (being able to search my whole pdf collection for "ribonucleotide reductase" with one search--as if they were Kindle format books)
Have a way to show the intersection of two or more collections, so I can find that book I stored in "unread" and "science fiction" without having to flip back and forth between the two collections, comparing titles.
ePub.
User-replaceable battery.
SD card storage.
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