While we're on the topic of Sony's Reader Store, we feel compelled to do some slight comparison in terms of selection.

ENGADGET: Sony Reader Pocket Edition (PRS-350SC) review

He added that the shift "allows Sony to make its e-book store compatible with multiple devices and its Reader devices open to multiple sources for content".

BBC: Sony to back open e-book format

As well as being used for in-store signage, E Ink's technology powers Sony's e-book reader, and in April, Seiko, a watchmaker, unveiled a digital watch built around an E Ink display.

ECONOMIST: REPORTS