Secondary desktop display
An outfit called Paperlike has built a 13.3 inch e-ink screen which seems rather a good idea for a secondary screen for your PC.
Kindle Oasis is available for pre-order for $289.99
While the e-paper book reader's thunder has been stolen by the tablet, e-ink is a lot easer to read and now Amazon has given its Kindle a refresh by scrapping its design and starting with something that can be used one handed.
Which is more than Coldplay
E-Ink has increased the number of colours it can manage to cover yellow.
Cheaper but still with E-ink
Switching between them