The Ergodex is a customizable keyboard system that allows the user to physically move keys around a control pad and then assign functions to them. The website has a good breakdown of the hardware and components of the system, but this blog post shows the capabilities better.

I think this could be a great tool for designing and testing custom interfaces for hardware and software development companies. However, it appears that Gamers have been the early adapters of this technology, as it allows them to have more control over their gaming environment.