I'd love to have a 24" or 30" USB-driven eInk screen or three for fairly static stuff like documentation. Running a terminal on an eInk display is probably less painful than repeatedly bashing your toes into a cinder block. Probably. An iPhone would probably make a far better portable screen. Cool hack, though.
[1].http://www.eink.com/sell_sheets/pearl%20sell%20sheet.pdf