I want a dual-screen folding device with screens approaching A4 and "hugging the edges". I want lots of storage space and a file/folder based ebook manager which supports arbitrary collections and keyword/tag/category and other filters. A couple of cardslots. No touchscreen but conveniently placed buttons which take into consideration left and right handed people. Don't need annotation, so don't try to force in a keyboard. Be sparse with the buttons. Dictionary lookup would be nice.
I don't really care for wireless connection, I'm fine with it behaving like a USB storage device and charging at the same time. Long-lasting battery life. Should support at least plain text, HTML, PDF, epub, and I mean support (not in the Sony "we support PDF - sort of" way). The OS should of course be linux-based and open to a bit of tinkering.
No messing around with audio players that eat battery life, I already have an ipod. Who doesn't.
I'm not asking for much, really