The kindleberry pi has all the elements I think are essential:

- low power - out door readable - light weight

The problem is that it isn't in one, handy package.

Laptops are limited by displays, it sounds like transflective-LCD is ideal. Panasonic Toughbooks have them, so could be a good bet.

I'd like to build an enclosure for a Pi and a PixelQi setup (they made the screens for OLPC). https://www.adafruit.com/products/1303

I assume there just isn't a market large enough to force these into existence?