Ubuntu for Android
This, or something like it, is the future: the computing device is portable, and adapts itself to the forms of input available. There's no reason why your display should have to be permanently attached to the device that drives it, and increasingly, it won't be.<p>I don't know what the implications are for Ubuntu or Android. But genuine support for a first-class computing experience is one of the few things that would tempt me back onto those platforms.