Re: FAD ALERT - A modern day flip-top
Of course for displaying text then having two screens next to each other, akin to two facing pages in a book, is nearly as good as a single screen. It's the display of video or images that is spoilt by a bezel between the two screens.
The MS Courier featured two screens separated by a hinge. The use-case its team were pushing was using two apps at the same time - the example they gave was a browser on one screen and a scrapbook on the other, for easy copy-paste (or rather, drag n drop) from one screen to the other.
There was also a two screened clamshell Android by Weird Sony that actually made it into shops.
LG are bringing the concept back with a second snap-on screen for their latest phone.