To paraphrase Steve Jobs, a central problem with multitouch as a desktop user interface is that we need to work with our hands on the horizontal (think of the keyboard, mouse, or tablet on your desk) and view on the vertical (the monitor in front of you). Jobs indicated that Apple testing showed users' arms would become fatigued from constantly reaching out to touch a vertical monitor.
Well, check out Media Computing Group's BendDesk concept, a wicked touch display that curves like a halfpipe:
I have problems believing something this bulky will become the dominant solution, but I think it's a neat and important step in the development of desktop multitouch. And as CNET's Ed Moyer suggests, I'd love to be able to modify Photoshop docs with my hands, then flick the finished image up onto the vertical part of the screen to examine.