I'd also love something like that. It seems there is a lack of demand though, as larger e-ink displays get expensive [0] and the only kits designed for the Raspberry Pi are small (<3"), so you'd need to figure out the protocol yourself.

That combined with a small keyboard and a phone for a hotspot would be awesome, I'd love to be able to sit in a park and code in the summer...

[0] 7.4" for $122, they sell a 10" for $300 http://www.digikey.com/product-detail/en/SW074AS182/SW074AS1...

Look into jailbroken e-readers. Not as much freedom with the hardware, potentially driver issues for peripherals, but cheap.

Recent relevant HN thread: https://news.ycombinator.com/item?id=13863046

Hey, that's my thread! In case anyone's wondering, I ended up with a $25 Nook Simple Touch. If you just want the screen and no touch capability, then look through the rest of the thread. Unfortunately, I have not had the time to play with it much yet, but I can tell you the rooting process works very smoothly for the NST.

What do I need to write to talk to the 10" display?

There's this 4.3" display: http://www.waveshare.com/4.3inch-e-paper.htm

I have one, seems well built, it's just been sitting in a box until I come up with a good use for it.

My google-fu seems to be failing, since I can't find an example of the larger e-ink displays being used with the pi. (excluding kindle and kobo hacks)