um... an application can treat two halves of the Ipad's touchscreen as distinct areas and do the exact same thing. you don't need two "physical" screens to provide that.
The idea of having two touch screens that can do just about anything sounds like a fantastic gadget that even James Bond would want to have.
Yeah, I can see that.
"Mr.Bond, I will chain you up in this dungeon now, but tomorrow I will kill you!"
Bond takes his Qpad (haha) and mumbles... "no... nope... nope"
Sorry, I won't be able to fit you in, this entire week is book solid with naughty liaisons. I can get you in next sunday, but then I'll miss moneypenny's piano recital...
Villian: say, what is that handy organizer gadget you have there? does it have TWO TOUCHPADS? OMG!
Bond: yeah. Would you like to see the stylus?
Bond clicks the stylus, offers it to the villain. the stylus starts shooting FREAKING LASER BEAMS and vapourizes the villain.
Bond: now that's a stylus death if I ever saw one.