An e-ink whiteboard sounds neat. The most important thing for me would be fast input response. The ability to just leave something up on the board and use minimal power to preserve the picture (as well as export it digitally!) is appealing.

The e-ink keyboards always poked at my interest but but I've gotten in the habit of not looking at my keyboard and I'm not sure I'd go back to doing so unless learning a new language. Maybe an e-ink function bar or something would be of more interest to me.

Off topic: I was wondering why this site took so long to load...(13.2MB PNG, 20MB of stuff in total).