My dream device is the "Solar A5 e-ink computer" - It's A5-sized laptop, so it fits in a leather zipped case for journals. If you're familiar with HP Journadas / Sony Vaios from early 2000s, that's roughly the form factor. There's a solar panel on the back of the screen / outside of the enclosure. The screen is e-ink, and the operating system is Linux Mint Debian Edition. For console mode, a good "writing station" applications are "mc" (Midnight Commander) and "ranger" - simple GUI for editing text in folders, like a blog/knowledge base.
Some challenges I've experienced: (1) Can't find A5-sized e-ink screens that accept HDMI as an input, (2) It would be cool to use a common Android phone, since there are many around. RaspberryPI is an option. Honestly, would love the simplest portable device that runs Debian Stable on a battery, (3) I have NOT been able to find small, A5-sized keyboards. Most small keyboards are cheap plastic bluetooth junk.
If anyone would like to seriously rally around this, let's talk'bout it. My vision for this laptop has always been "10:00 AM Austin Texas, sitting at a patio bar in direct sun, journalling/coding/writing". I have not been able to find any computer device that satisfies that situation, so there is obviously a market niche.