Asus is even kind enough to suggest uses for its new design:
Users can use the dual panel concept in a myriad of usage scenarios, for example as a conventional notebook with multi-touch screens, a virtual keyboard and touchpad; a multimedia hub, in which both dual panels could combine to form a larger display for widescreen entertainment; or an E-book mode in which users can hold the dual panel concept notebook just like they would a conventional book while flipping pages through intuitive gestures or by touch.
With its proven engineering prowess and lucrative leadership in the netbook market, expect the dual screen Asus laptops to mute any manufacturer excitement for the XO-2. Why deal with OLPC's continued stumbling when you have an Asus option?
And for those who might still be wondering why this dual screen laptop is exciting, I'll refer you to Pauli on Liliputing:
i don't see a laptop. i see a badass ebook reader.
Update: There's s very short glimpse of the prototype in action to be seen starting at 2min 11sec in this video from golem.de:
The video also mentions that the right display was damaged during shipment (hence why it only displays one color) and that it's not yet known whether Asus will really bring this concept design into mass-production.