As an engineer this may finally solve one of the most vexing problems I deal with, data sheets. They are all PDFs these days and they are unreadable on the old style Kindle (kinda ok on the DX) nice but a bit of overkill on the 3rd gen iPad.
The reason I want an e-ink screen device for data sheets is that it often sits on my desk for long periods on the pinout page or the 'example circuit' page. On an e-ink display it just sits there forever, on an iPad the display goes to sleep or if I keep it awake I burn through power too fast.