Jens Meissner demonstrates his Icontrol center application for iPhone-HMI system that enables interfacing with Siemens Simatic controllers.
In this video we see Jens using the iPhone accelerometer to control some motors, the responce time from the whole system is rapid and with much sensitivity also.
You can get moe info here but the knowledge of German language is essential.
aggrav8d is building a hexapod called SPIDEE-1, i'm watching the progress he makes and now i think it is time to be presented.
You can check the Facebook page for updates and sourceforge for the 3D simulation environment to control and communicate serially with the haxapod.
It is a very nice effort and a plus to open source community so it worths your click.