I’ve been checking out a bunch of portable and / or wearable input devices. It seems the best one in production right now is the Alpha Grip AG-5 (picture to the right).
I also found a few other interesting products. The Twiddler2 is a wearable mouse and keyboard. The EkaPad can apparently be hand held, but I couldn’t find any decent photos. The DataEgg looks cool as hell, and sounds easy to use, but I couldn’t figure out where all the keys were from the photos.
Then I came across John W. McKown’s designs for a Yet Another One-handed Keyboard. I like John’s open licence for prototyping, that’s very open-source style, I’m tempted to download the instructions and see about making one.