http://www.microfabrica.com/efabaccess/efab/
Loudspeaker Using
Vertical Electrostatic Drive
(1 mm tall)
http://www.microfabrica.com/efabaccess/efab/how_it_works.htm
EFAB technology is an additive microfabrication process based on multi-layer selective electrodeposition of metals.
The future has landed, and it's really, really small.
Are these guys publicly traded?