That KITTY device looks great, especially for being inconspicuous. I'm interested in making something similar, if just for simply controlling the media player, and maybe hooking up to some text-to-speech for reading my email. It seems like it'd be pretty easy to hack up a USB numpad into a glove, although it'd be neater to have it work via bluetooth. Textwriter also looks cool, since they're apparently planning to start production of USB models.

Another great project is Chordite; he was also working on a hand-based chording keyboard, but doesn't seem to have posted anything recently. Apparently his work was based on this work. Still, it's an interesting blog of the design process.