crystalfontz.com now offers full on linux ubuntu computer with 6" e-ink screen, touchscreen optional.
out of the box word processing with regular usb keyboard. fricking ethernet for god's sake.
http://www.youtube.com/watch?v=y2rfphDBV1o : thorough youtube demo of hardware, shows some software, including typing in spreadsheet program.
finally, finally, finally someone has done it. thank you crystalfontz. let the real digital writing begin.