One definition of cheap would be something like $0.10 for self contained electronics in a light bulb. Then the installation is practically an accident.

(I think home automation sounds like a neat idea, but I always end up trying to figure out $10 of value that it would provide...)

> $0.10 for self contained electronics in a light bulb

I guess we'll get there at some point, but I'd rather prefer a $.10 for a wall-socket adapter with electronics. Much more versatile. I'd buy truckload of these and connect all stuff through it. As for lights, why not $.10 light bulb slot adapter?

> I think home automation sounds like a neat idea, but I always end up trying to figure out $10 of value that it would provide...

Fun and hackability, obviously :).