Cool technology like this feels cyclical. Now we want what seems like a fancy graphing calculator.

It might even have nostalgic roots: I would totally buy an scaled-up version of my TI-83 Silver Edition

Someday soon we'll be able to order ourselves one-off machines like this (or any way we like). At least that's my hope

You could already hack something like that up if you want to spend the time: very low power ARM or MIPS board, Linux, e-ink display.

The problem, at least for me, is that 13" is about the minimum screen that I'm willing to consider, and this is the second display of that size that I've seen (the first being Sony's Digital Paper, which is currently prohibitively expensive for me). I'm hoping that the price on this will come down into my range once the tech gets proven out a bit, though if it ends up getting positive reviews I might not wait.

Same here, just vim, but that would be dream setup.