Muscle motion sensors
I have seen an interesting gizmo on the web that places a wire in two opposing walls. One essentially a transmiting antenna and the second a receiver. It is adjusted to the "inductance/reactance" of an empty room. When a body enters the room, it capacitively changes the field. The circuit detects this and knows that the room is occupied.
Breath Pressure Sensors
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<A HREF="http://piclist.com/techref/io/sensor/meat.htm"> Meat (people) sensors</A>
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