[saboot]

There is a keyboard similar to this, except it's even more strange. Introducing the DataHand : https://en.wikipedia.org/wiki/DataHand

[livingparadox]

I'd consider buying one if they were still selling...

[OctoberVlahos]

The Twiddler 3 chording keyboard seems like something you might find useful. http://twiddler.tekgear.com/