Emerging dev platform: The electical grid
In much of the Western world, electricity is so stable that it's boring. Plug your device into the wall and it works. A month later you get a bill, and after you pay it -- as they say in the country music business -- the circuit remains unbroken.
There is no reason why we can't enjoy a much richer, more sophisticated electrical grid with flexible pricing, self-healing circuits, and an app market full of opportunities.
Filtrete, for instance, offers a programmable thermostat that is Wi-fi-enabled and ready for remote access.