A fully open source mobile device from the hardware to the firmware through the OS. The OS could be Linux or BSD-based and able to run fully in touchscreen mode.  Perhaps even automatic adaptation of applications from desktop paradigm to mobile/touchscreen. 

The entire point of open hardware is to spawn a million clones and a new industry. I want to spawn truly ambient computing where the user is in control. 

And this is to break out of the current,  horrible duopoly of control.  

 This is hugely needed. A FOSS Windows too. One that actually works (not like ReactOS).