That doesn't fold though. It's a foot wide and 4cm thick. The whole point of this new keyboard here is that it folds, and that it's really thin, so that it's like 6" x 5" x 1cm, and can go in your handbag or coat pocket.
I still have two generations of the Palm folding keyboard, including the one shown in the link, and a newer one that's even slicker. They are in my junk box along with the Palm Pilots that I bought them for.
They were absolutely wonderful. I could unfold the keyboard, turn on the Palm, and be taking notes in a meeting or on an airplane, in seconds. Plus, the Palm devices had killer battery life despite the battery technology of their time, and some usability concepts that were way ahead of their time.
http://en.wikipedia.org/wiki/Happy_Hacking_Keyboard