[SageRaven]

Ever since these small devices have been in production, I've always wondered about their potential use in clandestine installations. Obviously things like the Shiva Plug are almost capable of hiding in plain site, so long as there's a plug near by.

I've also wondered if there are clamp-on induction taps that can be clamped to power lines (say, above the tiles in a corporate bathroom powering the lights) and drive low-power devices like a small Arduino.

This 9V hack is really cool for sensors and the like, but it wouldn't power a full OS with wireless AP ability for very long.

[johngalt]

How about this:

http://en.wikipedia.org/wiki/Thing_(listening_device)

Powered by an external radio beam. Transmits by modifying that same beam and reflecting it back. No internal power source. No active transmission. Weighs 1.1 ounce and was built in 1945

[Maakuth]

Hmm, indeed. Some sort of rogue mesh network installation powered by induction should be interesting for people like the Syrian opposition.

[chris_mahan]

I think right now the Syrian opposition is more interested in anti-tank and surface-to-air missiles.