TweakTown posted a review on the Sony PRS-505 E-Book Reader

So, why should you give a damn about these new fangled displays and why haven’t you heard more about them? – Well, they’re a new type of display designed to fill a niche in the market for displays that don’t require constant refreshing, unlike a monitor.

E-ink and e-paper displays have been subtly infiltrating our lives in a much more interesting way as well. Because of their incredibly low power drain, they make great static signs in just about every environment, from supermarket price tags, to mobile phone displays. The reason e-ink displays have been picked up for the e-book reader market is because of their low power consumption ability, the fact that the screen does not need to refresh until you turn a page and also their excellent readability in any lighting conditions.

Sony PRS-505 E-Book Reader Review